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old kai do his weird dance 5 hours long and gohans unweaken powers aweaken so ultimate gohan already surpass a ssj 
 
old kai do his weird dance 5 hours long and gohans unweaken powers aweaken so ultimate gohan already surpass a ssj 
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It's not that he ''can't''.... the Ultimate form is essentially the Super Saiyan Form... just, it does not exert any strain on him. Essentially speaking, he can power up to Super Saiyan 3 in this form. It won't exert any pressure on him. He just does not, because he does not have the required energy to power up. Goku could go Super Saiyan 3 in the Other World because he could put unlimited energy in his transformation. Gohan IS a Super Saiyan, but his apperance does not change.
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The Ultimate Form can be accessed at any time. While not in the Ultimate form, he can still go Super Saiyan. In Dragonball GT, Baby Gohan is Super Saiyan, showing that he can still go Super Saiyan.

Revision as of 11:16, 23 April 2013

Forum Why can't Ultimate Gohan go ssj?


[[Category:{{{1}}}|Why can't Ultimate Gohan go ssj?]]


i remember that he didn't use it in the fight against Buu, but i don't remember anyone ever specifically saying that he couldn't. in fact, i seem to recall old kai telling him that he could just before he went back to earth! so why is it that people keep saying that GT is stupid because he goes ssj in it? i get that the powers are pretty inconsistant, but if you actually think about some of the power levels, you see that that's true for the entire series!!!!!!!!! what i think is that the old kai power up raised his base-power, therefore it was harder to access ssj. i dunno, just a thought.

You're thinking of what he told Goku...

...before he went to fuse with Gohan (Vegeta)

As for transforming into a Super Saiyan, no he can't. The Old Kai gave Gohan the ability to access the power from his Super Saiyan forms without wasting the energy to transform. Essentially he can power up to Super Saiyan 3 without wasting the energy to transform, or the strain of maintaining that form.

Super Saiyan 3 was intended to be the last transformation, and this would have been a way to maximize that power. Unfortunately DBGT, decided to add another transformation making Gohan's power up inconsistent. Thus it was no surprise when GT ignored the power up entirely.

He can go ssj.

He just won't look different it's a powerup. When Gohan finished the training with old kai, Kai told him to just "do the super saiyan thing" when Gohan does this his eyes turn green like a super saiyan (probably just to show the viewer he went super saiyan), then go back to normal implying that when he does "go super saiyan" he doesnt change. So in GT when Gohan turns super saiyan and he goes into the form of super saiyan it goes against what actually happened in DBZ. This can also probably be used as a reason to say GT is not "canon".

He can...

He can, he just chose not to....


Yes, he can.

He can, but it would make him weaker than in the ultimate form (which looks completely the same as the base form before the training). Gogeta-buusfury MarkoSeke™ (talk) (contribs) Goten-buusfury 13:10, July 13, 2011 (UTC)

no ultimate form

there is no ultimate form


ultimate gohan is not a form its gohans power unlocked so that makes it his base form

Wrong

thumb|300px|right|see super saiyan is wat he does from the startHe didnt go super saiyan because thats wat triggers the full powerup hes not transformed but he is "super saiyan"Tjakari 20:54, July 13, 2011 (UTC)

He can

Old Kai released Gohan's power. Goku stated that he was "stronger then he ever was as a Super Saiyan". Thus, his base power exceeded the power he had previously shown as a Super Saiyan and Super Saiyan 2, and thus at the time he had no need to go Super Saiyan. If you consider GT canon, he does later go Super Saiyan against some later enemies.

He can....

Edit By: That Guy

The Elder Kai said the training was complete. Gohan has reached his maximum power for the series. It was to catch him up with the others that had reached Super Saiyan 3. That being said, he has gained new "Mystic Powers" from the training with the Elder Kai. This "Mystic Power" is also known as Gohan's hidden power. Most people that have seen Dragon Ball, Dragon Ball Z, Dragon Ball GT, and Dragon Ball Kai would know that it was anger that used to releash his power. This training has given him confidence and has helped him control the powers that he could not before. Basically, all the Elder Kai did was raise his base level to a point to where he no longer needs to transform. If he were to transform, he would destroy the planet he is trying to protect. He did not transform because he did not expect Super Buu to have the ability to absorb people and their energy.

Next time... on Dragon Ball Z...(I miss the sound of that. They also could have done better on Dragon Ball GT.)

-That Guy-

He can go ssj

He couldn't go ssj in his Ultimate form because old kai gained all power of his body which wouldn't let him go ssj in this form. As we all know when Majin Buu absorbed SSJ3 Gotenks then gohan would go ssj form if he could but he could not transform because it was the limit of him and the ultimate form had the entire hidden energy of his body including his super saiyan forms.

But there is another matter in it. As you see the ultimate form of gohan as his base power proved stronger that ssj3. It meant it would take a lot of struggle for Gohan to become a ssj with a lot of power to be doubled .

He can't go SSJ

Ultimate Gohan can't go super saiyan and there would be no point.

Lets say your normal form power level is 1.

In SSJ your power level is 50.

In SSJ2 your power is 100.

In ultimate your power level is the full extent of your power. (meaning It could be 10000 depending on how strong your body is.)

When Gohan asks Old Kai how to use Mystic form, Old Kai tells him to "Just become a Super Saiyan, and believe." So Gohan does. You will notice that during the subsequent transformation HIS HAIR NEVER CHANGES COLOR. Therefore this IS his new version of Super Saiyan, and is the form of his utmost potential. GT is not canon.

Of course he can

He CAN transform into SSJ, SSJ2. I dont think he would get weaker if he did transform into SSJ or SSJ2, since the "ultimate" is his base form not a new transformation, nor stronger since his base form has all his strenght (include the hidden power), so transforming into SSJ or SSJ2 would change nothing, Gohan would stay as strong as on his base form. BUT SSJ, SSJ2 and SSJ3 (which I believe he could transform quite easily after he unlock his hidden power) consumes more ki than the base form, specially the SSJ3 form, so Gohan will not get stronger, but he will loses more ki after time than if he is on his base form (his ultimate state), so that's why he did not transform into any SSJ forms. Thats what I believe at least.

I dont know why he did transform into SSJ on DBGT. DB has a lot of inconsistences so I would be surprise if Akira, or whoever wrote DBGT, just forgot what the old Supreme Kai said. Although the suppose lack of training between DBZ and DBGT probably made him weaker, so he did transform into SSJs forms to get a little bit stronger. Or maybe they decide that if Gohan transforms into SSJ/SSJ2 would be better for a visual stand-point?


It's pointless. Old Kai said that even if Gohan went Super Saiyan, it wouldn't change anything except his appearence and the amount of ki he would be using. Gohan's Ultimate power is equal to a Super Saiyan 3's. Technically, he's already a Super Saiyan without transforming. All of his hidden potential is unlocked. All means all. Duh



Just watched it 10 mins ago. Even Goku tells Gohan in Other World that he will be even stronger when he turns Super Saiyan now. Just dumb*ss writing or editing it seems is why he didn't change.

He could...

Okay, look at it this way,

Say your base was 1. Ultimate unlock= 100

The super Saipan forms are multipliers, so, say SSJ= x2 Then SSJ2= x4

So if he went super saiyan while ultimate it would be:

Start- 1 Ultimate Unlock- 100 100 (ultimate) + SSJ (x2)= 200, or doubled energy while in ultimate form, then another x2 for SSJ2 Ultimate to equal x4 ultimate.

He can...

Ultimate Gohan CAN go SSJ, he just didn't want or need to. And he does go SSJ in GT.




Some people just dont think..

If he could go super saiyan to become even stronger why the hell didnt he do it when he was losing to buu with gotenks absorved?

Or why would he choose not to transform and become stronger when everyone was getting raped by hirudegarn?

No he cannot

Listen, Gohan CANNOT go SSJ while he is "ultimate". Old Kai drew out all of his power, meaning that he has all of his power in base form. There's no such thing as "he can transform but he'll be weaker" or "he can but it won't make a difference". The power of his SSJ and SSJ2, along with all the other the power that he never got a chance to unlock, was drawn out by Old Kai for him to use in his base form, as base form obviously doesn't hold the SSJ or SSJ2 power....in a way, SSJ power is like "locked power" within you, and once you "unlock it", you transform into an SSJ...afterwards, it can be "locked" and "unlocked" at will, and it can also grow in power...Gohan had this SSJ power, along with another level, SSJ2...and he also had a ton of power he still hadn't unlocked...

Now, when Gohan is in base, his SSJ and SSJ2 power is not present. Also, the power he never unlocked is also, obviously, not present. Old Kai drew out all of Gohan's power, so Gohan can use all this power while in base...he can't be SSJ anymore because his SSJ power is now a part of his full power which was drawn out by Old Kai, which he now sustains in his base form, or "Ultimate form". This also helps because he doesn't have to transform into a different form that slowly drains his ki...he has access to all of his power "naturally" in his base form (because, obviously, being in base form doesn't eat up ki, because it's his "natural" form), so he doesn't have to worry about losing ki unless he actually uses it in battle, unlike, say, Goku, who, upon becoming an SSJ3, rapidly loses ki due to the strain of the transformation.

If Gohan could go SSJ, he would've done so...those saying "he never needed it" are dead wrong...Gotenks-Buu anyone? If Gohan could get a boost similar to a Super Saiyan at that point, he'd definitely use it, but he didn't.

That guy pointed his finger...That guy pointed his finger and Kakarot fell down!..PrinceVegeta66PrinceVegeta66 00:09, July 28, 2012 (UTC)

Here's my view..

Acutally, we can't gurantee that Gohan can't go SSJ while his hidden potential was released by Old Kai. We are not even sure if he could transform into a Super Saiyan because we didn't see him to do so. He fought Super Buu and thought he could beat him but the wonder starts when Super Buu absborbs SSJ3 Gotenks along with Piccolo, inspite of sensing Buu's rapidly increased ki, Gohan didn't think to transform but he knew that his energy was less than Buu's energy. Perhaps, it was a mistake of the creators or some other unknown fact but I THINK Ultimate Gohan could tranform into a Super Saiyan because according to the aspects of series it indicates that.. no matter how much powerfull a Base Saiyan is he can increase his power level so far by just transforming into Superior states just like the Super Saiyans. Mysterious Luster (talk) 05:10, July 28, 2012 (UTC)

Let's think about this for a second...

If gohan was able to go SSJ in his ultimate form, do you realize how strong he would be? He was able defeat super buu with his "base" form which is stronger than or almost as strong as ssj3 goku. This is because he(gohan) is stronger than gotenks(based on their fight with super buu) whom goku said is stronger than him. Can you imagine how powerful gohan would be if he went ssj2? He might even be stronger than gogeta(vegito) if he could go ssj2. And why didn't he go ssj when he was being beaten around by super buu(with gotenks and piccolo absorbed)?

Base>SSJ>SSJ2=Ultimate(SSJ2 - energy costs of transformation)

When he was with the old kai, i think that he dramatically increased his base power and gave him the ability to go into ultimate form. With the ultimate form being an easy transformation to unlock all of his powers without going SSJ. i.e. if he had attained SSJ3 then his ultimate for would essentially give him all the power of SSJ3 without the harmful side effects. Gohan can still go SSJ and SSJ2, but there isn't much of a point. He might go SSJ 1 to conceal his full potential, but SSJ2 is pointless because it takes alot more effort to transform.

I would ignore GT because it is inconsistent with the series. In GT their powers are all over the place. Gohan never goes into ultimate form. And as I said earlier, if his ultimate form actually is his base form, then he would be infinitely stronger than everyone else in the series. He would be stronger than SSJ4 goku, but he isn't. No one ever goes SSJ2 in GT(or if they did, they never actually show the SSJ2 animations). When trunks and goku fight luud they barely use SSJ powers(even though they were almost beaten).

—Zecias


First, I would like to say that the power level doesn't matter in the series while the major aspects are to emphasise the Saiyans. As we all know that we have been wondering, witnessing the infinite power of the Saiyans that we almost share a thought that a Saiyan doesn't stop at anything if he knows to increase his power either it's Ultimate or anything else.. we don't even know if a Saiyan's Ultimate Super Saiyan form is SSJ4 because there could be a lot more. I know, it would be ridiculous if we really compare the whole Saiyan's Power theory to what the series showed us (that Saiyans can increase their power by achieving a much more powerfull states) but this the truth plus it was never said that Gohan was in a particular form or transformation named Ultimte form, it was just his Secret hidden power which was released in that form and nothing. Old Kai never said that there was a form like that. And if we consider the fight between Gohan and Super Buu and why didn't Gohan transform into a SSJ? I think, Gohan was too overconfident in his new power which led him to stay in his current state. He couldn't realise in that moment that he could transform into a SSJ or other forms because he was so busy fighting Super Buu. We all saw that Gohan did these kind of mistakes earlier while fighting with Cell and Bojan in Bojack Unbound that he forgot about what he really could do with his powers, it was Goku who always used to encourage him and make him believe in himself in order to regaining his confidence. But, Goku wasn't there when Gohan was fighting with Super Buu, may be that's why Gohan didn't go SSJ.

I won't consider GT here because that series was thought totally different in many parts which doesn't share the same informations with Z. Mysterious Luster (talk) 03:48, July 30, 2012 (UTC)

Go ask Toriyama and stop babbling about!He's the only one that can answer this!

Becaus it is another form of Gohan

He can it's just his appearence doesn't change. His power and strength increase like a Super Sayians would.

read

gohan doesn't need to go super saiyan anymore. he's at full power in that mystic form. When transforming you're destroying your body and becoming weaker throughout the process. But in the new form he can be alot stronger without any strain. why do you think goku made him stay in super mode during the cell games? so he can adjust to the super saiyan mode and fight with less strain. you don't need to make a theory just pay attention when they speak or read the manga99.180.200.199 15:27, September 4, 2012 (UTC)

Here's my theory don't bash its just a theory not facts

Everyone says why does gohan go ssj in gt well i have a theory you see gohan did lose the mystic powers but not the form notice his eyes design in gt there fully drawn whereas they werent before in truth gohan can still transform into a ssj while in his mystic form cuz its his new base form however the power the mystic form grants him is greater than his ssj forms thus becoming ssj would do nothing since the power boost from mystic overlapped them however it is possible gohan lost the mystic powers/ not form due to his lack of training until gt which caused his mystic form to become significantly weaker probably close to what he was during the start of the buu saga so the power no longer overlapped the ssj ones which is why he goes ssj in gt another it is possible he lost the powers after dying in earths explosion possibly as old kai never said the power up was permanent or not and that could explain why his power was hardly enough for gokus spirit bomb against buu

Diagram

Ultimate Gohan Explanation

The big black circle is Gohan's full power. What Elder Kai did was remove the blue circles. The bigger the circle, the closer to full power. The forms listed are the transformations needed to reach that level of power.


Read the caption and open the full picture. Fatdude (talk) 22:06, September 8, 2012 (UTC)

Maybe due to Gohan skipping his training and focusing more on his studies as a Scholar and his family (probally dued to peaceful times no doubt) over the ten year gap seen after the defeat of Kid Buu, his Hidden Potential vanishes which is why it's not seen in Dragon Ball GT at all.Nikon23 05:53, December 4, 2012 (UTC)

and also Super Saiyan 2 was seen briefly by Goku (GT) as he bypass to Super Saiyan 3,  and Gohan and Vegeta clearly uses the Transformation during the Battle against Super Android #17 and Omega Shenron. the budget for the series probally was cut since GT didn't do so good which is why no lighting aura was not visible on them. also when they power up to the form their Super Saiyan Aura is more glowing like than Trunks and Goten were.Nikon23 05:53, December 4, 2012 (UTC)

and Akira Toriyama must considers Dragon Ball GT canon to the anime because he says that the upcoming movie Dragon Ball Z: Battle of Gods takes place between Dragon Ball Z and Dragon Ball GT in the lost decade in other words between Dragon Ball Magna Chapter 517 and 518, regardless of what most fan think of GT.Nikon23 05:57, December 4, 2012 (UTC)

Human

Maybe his Hidden Potential is something (for some reason) from his Human half, so it unlocks his human powers and locks away some of the saiyan stuff. Maybe he figures out how to re-unlock his saiyan transformations some time in those ten years between Z and GT. Who knows? 

if you watched to series then you would know that all sayians get more powerful as they get defeated thus thats why when his power was not enough to beat gotenks buu he got the powers to transform

He doesn't have to

He's always mystic. That means he's always at his strongest, without transforming--Ssj3gogeta96 (talk) 07:10, December 19, 2012 (UTC)ssj3gogeta96

NO Gohan CAN NOT

If Gohan tried to go SSJ he would destroy the earth.So this is a pretty much reason of Gohan not willing to go SSJ.Anyway,Gohan CAN NOT go SSJ,if he could,why not just use it against Buutenks?Gohan would kick Super Buu's ass

UM

well gohan cannot go ssj or beyond becuase all of his power has been put into his base form. meaning that he cant tap the next level of power becuase there is no next level. and in gt he was able to go ssj becuase he had lost some of his power over time due to being a "normal person" so he could tap into more power through transforming. elder kia unlocked his power but never said it was a permanent transformation.

Ok from what I remember from the series is this after Old Kai was done with the ritual of unlocking Gohan's locked powers.  He actually tried powering up, and was shaking the Supreme Kai planet.  He was told to stop and he asked the Old Kai if he can still transform into a Super Saiyan, and the Old Kai said yes but there's no need for him to do so because he had the power necessary to destroy Buu anyways.  Besides from what I heard anyways that if he went beyond Super Saiyan that the Earth wouldn't be able to handle his power lvl and be destroyed.  According to the power lvl chart he had no reason to train beyond Super Saiyan 2 anyways because in his Mystic Form he's at a Super Saiyan 3(or close to it).

Let's be real

If he could, he would have and just beat up Buutenks and not taken a beaten. And if he could then the forms would have been a "power down" for him. I'm sure the creators thought about this. Base - SS -> SS2 and Base - > Ultimate. I believe those were his choices. So he could go SS cuz he's a saiyan but his ultimate form required a different transformation. I know none of us would compare DBZ to GT but Goku was kinda the same with SS4; Base -> SS - > SS3 and Base - > SS4. He never went from SS or SS3 to SS4, he was always at his base. Gohan did lose his Ultimate transfomation in GT due to him not training and this is understandable because in the Badabi and Buu saga he could barely muster the power to go SS2 and when he did it was weaker than his previous SS2 at the Cell Games. So yeah he probably could go SS and SS2  but he would be weaker. Ultimate wasn't a transformation but a power up that exceeded SS and SS2 but he had to do it in a base form. Just think of it like Piccolo; yeah he's a Super Namek but that doesn't mean he's at Super Namek Full Power all the time. His base is Super Namek but he summon his Super Namek power when he needs it.

Side Note: PLEASE STOP QUOTING WHAT THEY SAID FROM THE ENGLISH VERSION. Sorry but they do change the words around.

Ok i will end it here guys

gohan never went ssj2 after the world turny when he got his power obsorbed... mabey u all should start from there.

lets say we put it like this gohan is liggitamitly the second strongest warrior in the universe ((under goku and above vegeta yes above vegeta. im standing on that till my death bed vegeta cheated his way to ssj4 and come to find out its equal only 34% above his ssj2 form. not to mintion he never went ssj3. gohan on the other hand was the first to fly, was the first to surpass goku in power during the fight agenst raditz for a very short period of time, was 3rd to reach ssj and darn near mounted the same power with goku and 1st to reach ssj2. He gets week from not practicing dramaticly during the GT saga and in turns when he faught in the world turny he got his power absorbed. so even in downfall he's still #2 at least!) you put that ontop of Ultimate form....... lemme say it again ULTIMATE FORM...... for you stupid people out there.... lemme say thi one word........  ULTIMATE!!!!!!!!!!!!....... WHY..... DOES THAT MEAN HES AT MAX POWER? DOES THAT MEAN IF HE CHARGES UP HE'LL HAVE THE AURA OF SSJ 1-3? OH! DOES IT MEAN THAT DURING THAT PERIOD OF TIME HE'D BEAT GOKU DRAMATICLY........ YES! so why in the hevenly fathers name would he need to turn ssj or ssj2? hes ultimate meaning:

class="ts" Being or happening at the end of a process; final: "their ultimate aim was to force his resignation".

|- | style="height: 10px;"| |- |Noun{| class="ts" | style="padding: 0px;"|The best achievable or imaginable of its kind: "the ultimate in decorative luxury". |} |- | style="height: 10px;"| |- | style="padding-right: 5px; vertical-align: top;"|Synonyms{| class="ts" | final - last - terminal - utmost - extreme - eventual


so if he turned ssj1 or 2 he'd go down in power level. IM RIGHT.... YOU CAN REFER TO SCENES OR MANGA ALL YOU WANT BUT FACT IS DBZ DONT THINK THINGS THROUGH CORRECTLY..... but hey... be glad its not the Final Fantisy series or we'ed all be lost... lol am i right chou kids XD |} |}

Gohan probably can

Remember back in the Frieza Saga when Guru "unlocked" Gohan's potential. It wasn't a transformation it just made gohan stronger. Old Kai can do the same thing, but on a much larger scale of course. The dialog about Gohan after Old Kai unlocks his power heavily implies he can go Super Saiyan as no on ever says that Gohan can't get any stronger. What we know for a fact is that for Gohan to release his true power he has to go super saiyan, but instead of going super saiyan Gohan's true power is revealed, thus turning Gohan's super saiyan form into a simple powerup. This implies(to me at least) that his super saiyan levels have been relocked and he once again would need to unlock them, but the emotions needed to unlock it would be on a much larger scale do to his drastic new power. With the new Super Saiyan God form and rumors of a new Akira starting a new Dragon Ball series after the Buu saga, I believe that we could see Ultimate Gohan go Super Saiyan. I mean some people said that Broly couldn't go beyond LSSJ but he has(unoffically anyway). We can't take GT into account anymore as with the new Super Saiyan God form; GT is now offically a what if story arc.


/\ The movie isn't canon. Both the movie and GT were made by Toei, not Toriyama. The GT haters never understand this.Sandubadear (talk) 19:53, March 8, 2013 (UTC)

^ Wrong, the movie is canon. Akira Toriyama created the story and is deeply involved in it's development. GT was discredited by Dragonball onljne.

/\ No, you're wrong. I am never wrong. Go to the Battle of Gods page and see this part:



Yūsuke Watanabe wrote the story of the movie. They just mention Akira Toriyama as the original series creator, because he is. Go to every movie's page, and you'll see it:

  1. Dragon Ball Z: Dead Zone
  2. Dragon Ball Z: The World's Strongest
  3. Dragon Ball Z: The Tree of Might
  4. Dragon Ball Z: Lord Slug
  5. Dragon Ball Z: Cooler's Revenge
  6. Dragon Ball Z: The Return of Cooler
  7. Dragon Ball Z: Super Android 13!
  8. Dragon Ball Z: Broly - The Legendary Super Saiyan
  9. Dragon Ball Z: Bojack Unbound
  10. Dragon Ball Z: Broly - Second Coming
  11. Dragon Ball Z: Bio-Broly
  12. Dragon Ball Z: Fusion Reborn
  13. Dragon Ball Z: Wrath of the Dragon

You're wrong, so get out of here.

Sandubadear (talk) 21:47, April 1, 2013 (UTC)



^ Had you read your own link you sent and not boost your ego with "You're wrong and I'm right" You wouldn't look like an ass right now. "The global phenomenon Dragon Ball is being made into a movie using Toei Animation’s latest technology, consistently realized as a Toriyama work, with the original author Akira Toriyama himself deeply involved from the script stage for the first time. " He was also interviewed here: http://www.saiyanisland.com/2013/03/akira-toriyama-interview/

And he also said here: "What I did was create the story" Go research more.


Nobody realised this but since now the maximum limit of dbz was a super saiyan 3 right.....so if gohan has reached his MAXIMUM limit he would have reached his most unhidden power which would be...wait for it...super saiyan GOD. That's right if Goku can do it and he is a saiyan why can't his son go super saiyan GOD too..... by that logic Gohan can either actually turn super saiyan and increase his powers or he has reached maximum saiyan status and has the power of a super saiyan GOD which we all know isn't the case. Also it will suck bad if he actually  reached his limits i mean, he is a saiyan....let's not forget that when he receives an almost fatal or fatal blow he becomes even more stronger so that there completely justifies the theory that he can surpass his current limit and one way of doing that is by going super.

thanks i would enjoy if you commented and tell me what you think :)

He could, but it wouldnt make any difference

I like to think that SSJ forms are a way to achieve your true power. "Ultimate" just allowed Gohan to achieve his true power without needing to transform into anything. Just to make it clear, true power =/= hidden power (although Supreme Kai unleashed Gohan' hidden power as well). 

Lets pick Goku, by the time before Kririn dies his base form power was 3m, with Kaioken x20 60m, but his true power was much more, probably around 100m and a hidden power level of around 150m. He cant use that power though, but when Frieza kills Kririn, Goku unlocks his hidden power and now can transform into SSJ, his true power is now ~150m but only achievable in SSJ form. His true power continues to grown, so by the time he fought Cell, his true power was way ahead of his SSJ form (but not quite enough to achieve SSJ2), which itself was way stronger than Frieza' saga SSJ form.

old kai do his weird dance 5 hours long and gohans unweaken powers aweaken so ultimate gohan already surpass a ssj 

It's not that he can't.... the Ultimate form is essentially the Super Saiyan Form... just, it does not exert any strain on him. Essentially speaking, he can power up to Super Saiyan 3 in this form. It won't exert any pressure on him. He just does not, because he does not have the required energy to power up. Goku could go Super Saiyan 3 in the Other World because he could put unlimited energy in his transformation. Gohan IS a Super Saiyan, but his apperance does not change.

The Ultimate Form can be accessed at any time. While not in the Ultimate form, he can still go Super Saiyan. In Dragonball GT, Baby Gohan is Super Saiyan, showing that he can still go Super Saiyan.