Complete the - Digimon Rumble Arena
Complete the game once.
Enter the password MINNYN.
Enter the password SERIUS. Or complete the game with Gabumon and Agumon.
Enter the password KIMJOY.
Enter the password LINMON.
Imperialdramon (Paladin mode):
Enter the password ROYBOY. Or complete the game with both Veemon and Wormmon in first, second, or third place.
Enter the password KENSAN.
Enter the password QRIOUS.
Play the game on any difficulty setting without losing a round (not a continue). During the fight with the last Digimon before Reapermon, BlackWarGreymon will challenge you. Beat him and Reapermon without losing a round to unlock him.
Get digivolved form:
To receive anyone's digivolved form, complete the game with them.
Get Mega form:
To receive anyone's Mega form, complete the single player game with that person. You cannot be a Mega in single player mode