Press and hold Start on controller two while the game loads. Then, press L1, R1, R2, L1, Select, Start at the main menu or while the game is paused to enable cheat mode. Press the following buttons on controller two for the different cheats:

God mode:
Triangle

Unlimited power:
Circle

Level skip:
Select

All items:
X

Super unit strength:
Up

Weak unit strength:
Right

Current research completed:
Down

Additional structures:
R1

Additional units:
R2