Unlimited combos:
Hold L1 + R2, then press Square, X, O, Triangle at character select screen. The word Combo will appear under your player to confirm correct code entry. The combo meter will automatically be refilled. 

Hyper mode:
Hold L1 + R2, then press Up, Down, Up, Down, Square, Triangle, Triangle, Right, Left at character select screen. 

Random select:
Hold Up and press Start at the character select screen. 

Easy CPU opponent:
Pause the game and press X, Triangle, R2, Triangle, X. 

Reset cheats:
Pause the game and press Square, O, Triangle, X. 

No human damage:
press X, Triangle, R2, Up. 

Stronger hits:
Pause the game and press X, Triangle, L2, Down. 

Weaken opponent:
Pause the game and press X, Triangle, L2, Right. 

Stop timer:
Pause the game and press X, Triangle, R2, Left. 

Invincibility:
Pause the game and press X, Triangle, R2, Up. 

Two times less powerful hits:
Pause the game and press X, Triangle, L2, Right. 

Disable all enabled cheat codes:
Pause the game and press Square, O, Triangle, X.