Password 
On New Game menu - press L1 - choose Code Entry 

Cheat code:         Effect:
99801               All Bonus Game
85061               All Gallery Items
66206               Unlimited Special Attacks
28260               1 Hit Dishonor
89121               Max Level
65049               Infinite Health
90210               Double Damage 


Unlock 3rd Appa Flight Mission
     To  unlock  the  3rd Appa flying mission, have an Avatar the Last
Airbender  saved  game on your memory card. When you load the game up,
it will automatically unlock.

Unlockable:                   How to Unlock
3rd Appa Flying Mission       Have an Avatar the Last Airbender 
                              saved game on your memory card.