Bunkai Teleport (分解テレポート Bunkai Terepōto) is one of Janemba's techniques while in his transformed state. Stemming mostly, if not completely, from his power to control reality, Janemba in his final form has the ability to fade backward while he is breaking into cubes, very similar to Instant Transmission.
This ability actually pulls him through more portals, much like Illusion Smash, but requires him to separate into cubes first. This is supported when Vegeta fired a Ki Blast at the space Janemba just left, but the blast hit him where he reappeared as if it traveled with him.
Super Janemba also uses this technique to perform the Cosmic Illusion counterattack.
Appearances in games
Super Janemba uses the technique in Dragon Ball Z: Buu's Fury during the fight against him in Chapter 8 ("Janemba"). Super Janemba's teleportation technique was named Bunkai Teleport in Dragon Ball: Raging Blast 2. In certain video games such as Xenoverse 2 it is incorporated into his standard combos and a unique ability of Super Janemba and Super Janemba's Supervillain form.
In Dragon Ball FighterZ, it is called Phantom Shift.