Moves:
Back Flip: Press Square + Down
Somersault: Press Forward + Square

Get Invincibility:
Go to the press start screen and press RIGHT,X,R1,TRIANGLE,UP,L2,X,LEFT,L1,CIRCLE X R2

Get All Weapons:
Go to the press start screen and press UP,DOWN,X,SQUARE,R1,TRIANGLE,TRIANGLE,LEFT,
CIRCLE,L1,L1,RIGHT

Faster Speed:
Use Agent J

Better Guns:
Use Agent K