Original URL: http://www.psxextreme.com/psp-cheat-print/405.html
Avatar: The Last Airbender

Enter the code at the main menu, you should hear a sound:

Invincibility:
X, X, Square, Triangle, Circle, Circle, Start

Enter the Code menu in Extras, and enter the following passwords:

37437 for All Treasure Maps Unlocked
34743 for Double Damage
24463 for Infinite Chi
23637 for Infinite Copper
94677 for Infinite Health
53467 for Infinite Stealth
54641 for One Hit Dishonor
97831 for Unlocks Character Concept Gallery