Got it finally. If you want the trophy, take these steps:
1) Set someones finishers and signatures all to Dragonrana from the top rope (Move I know you can catch, there's probably others), then make them the CPU opponent
2) Pick a character that's a heavier weight class than your opponent and has the ring escape ability
3) (Optional) Set the match rules to be iron man, 3 finishers and low health. Will make it quicker and easier.
4) When you see the AI run towards to top rope to hit a finish, use the right stick to instantly escape the ring, then run back in. instead of doing a wake up taunt and then getting down, they will actually dive on you
5) Reverse and powerbomb them