1st Person Mode:
While playing a 1 player game, press and hold L1, L2, R1, and R2. While holding, press diagonal right down. If done correctly,you should be in 1st person mode. Do the exact same thing to turn it off.
Clonus version of opponent:
Hold Select while choosing an opponent at the Character Select screen to fight against the Clonus version of that character.
GameShark Codes
Extra Health P1 8009a038 6400
Low Health P1 8009a038 0100
Extra Health P2 8009a6ac 6400
Low Health P2 8009a6ac 0100