Ok now I'm going to tell most of the ones i know they are like 30-40 codes and if they didn't work for you it was because is version 1.0, Gamecube and AR Codes not GameShark Codes so anyways:
REGION: Unspecified | CLASS: Miscellaneous Codes
PSO AR Codes
Level up: 1>>>145 Note 1:You need to kill a Monster to level up Note 2:The Monsters have lots of HP 67RM-7QJC-HU4B4 E4BP-6DDU-NWMAT