Note:-  This cheat is also known as Giants

Cheat menu:-  Enter ALPUN as a code.
Invincibility:-  Enter MOLITOR as a code.
Level select:-  Enter MBP4UJP as a code.
Unlimited ammunition:-  Enter FALLOUT as a code.
Unlimited jet pack fuel:-  Enter 38HK as a code.
Unlimited Mana:-  Enter BGDA as a code.
Front view:-  Enter XTRASEE as a code.
Multi-color graphics:-  Enter DOROTHY as a code.
Red graphics:-  Enter ANGRY as a code.
Green graphics:-  Enter SNIPEME as a code.
Blue graphics:-  Enter UDDOIT2 as a code.

Passwords - Camera mode

Password Effect  -
XTRASEE Enable Front View Mode
CLOSEUP Enhanced Zoom mode
KVIEW Front View mode for Kabuto only

Password Effect  -
LILBUDY Access Cheat Giftshop
THEHARE Speedy Player

Gameshark Codes

(M)Must Be On EC9038281434107C 
Invincible 4CA7E7801456E7A6 
Infinite Mana 4CA7E7841456E7A6 
Infinite Jetpack 4CA7E78C1456E7A6 
Infinite Ammo 4CA7E7901456E7A6 
Have All Missions Go to the "Load" option. 4CAE5D181456E7A6 
Have Mecc Teammates 4CAE49101456E7A6 
Enable Target Select 4CAE44981456E7A6