I've just found a new infinite combo trick, and it can work on both Wii U and 3DS versions. So, what you do is have the Cloud DLC. Then, go to the Midgar Stage without omega form. After that, you get the summon materia in the stage. You're trying to get Bahamut ZERO to appear. Then, you grab you're opponent to the target the hazard will hit and then pause exactly at the right time and watch it go.