1. Go to the main screen after you push start and type in R2, R2, R2, L2, L2, triangle, square, square, circle. And you will get infinite life and will be able to do your special at any time.

2. Hidden Characters: At an option screen:
Hold R1, R2, L1, L2 And Press Circle, X, Triangle, Circle, Circle, X, Square This Should Work...But might not...