Agumon:
Reach level 16 with Guilmon.
Clavisangemon:
Successfully complete the Undead Yard quest with Veemon or the Item Road quest with Dorumon.
Dorumon:
Reach level 16 with Agumon.
Guilmon:
Reach level 16 with Veemon.
Herculeskabuterimon:
Successfully complete the Undead Yard quest with Guilmon or the Item Road quest with Agumon.
Wargreymon:
Successfully complete the Undead Yard quest with Agumon or the Item Road quest with Guilmon.
Weregarurumon:
Successfully complete the Undead Yard quest with Dorumon or the Item Road quest with Veemon.