: Certain passwords, particularly for Colosseum battles, won't activate until you have reached a specific point in the story or recruited certain NPCs like Hagurumon.
To reach higher levels like Mega (Ultimate in Japanese), you often need special items. digimon world re digitize password
These provide permanent increases to your Digimon's maximum stats: Offense Chip x3 Defense Chip x3 HP Chip x3 MP Chip x3 Speed Chip x3 Colosseum Challenges : Certain passwords
. After entering a valid password, you will receive an in-game email containing the rewards. How to Use Passwords particularly for Colosseum battles