Skip to Credits

Start a new game, then select the Story Mode. When the game starts, pause and press:

Up, X, Left, Y, Down, B, Right, A, L, Y

Glitches
How to beat the computer with no damage taken

When the fight starts, jump towards the CPU and kick him or her in the knees while you are in the air.

For some reason, the computer never blocks when you kick hiim or her in the knees.

This works against any character, and also works on Difficulty 8.