Infinite Ammo
At the Main Menu, press Down, Right, Up, Left, L2, L1, R2, R1. Then to open an in-game Cheat Menu, press Start during a game.
Infinite Life
At the Main Menu, press Left, Left, Left, Right, L2, L1, R2, R1. Then to open an in-game Cheat Menu, press Start during a game.
All items
At the main menu, press Right, Left, Up, Down, L2, L2, R2, R2. Then to open an in-game Cheat Menu, press Start during a game.
Cheat mode
At the main menu, hold L1 then press X, X, X, X, X, Circle, R1, R2, R2, R1.