Baten Kaitos Origins cheats and cheat codes for Gamecube

Rank up in the coliseum:
First you have to finish all the matches in the rank you are currently.
Make sure you have enough RP. Complete the following quests or tasks
to reach the new rank. 

Taks - Ranks:
Complete Rank 5 - Get Rank 5 Qualifier
Read the letter at the shop in Vega - Get Rank 5
Read the letter at the shop in Komo Mai (Anuenue) - Get Rank 4
Read the letter at the shop in Cebelrai (Sadal Suud) - Get Rank 3
Read the letter at the shop in Sheliak (Diadem) - Get Rank 2
Reach Alfard a 2nd time and get the Dog Tags - Get Rank 1
Finish the champion battle - Champion

Advanced Champion
Finish the quest in the champion's room, then finish all advanced battles

Find the weakness of enemies in battle:
Go to Rodolfo's mansion to find the Dragon Claw. The Dragons Claw reveals 
all enemies' health for a limited amount of time in the battle.
If the enemy have a weakness, you will see on the left side, below each 
enemy's health bar. It will appear as "Weak: ".