Digimon Battle Spirit - Platform: Gameboy Advance

Agumon:
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An extra comes with Gabumon. He is the same as the first one, 
only with a different digivolution and can float. 

Black Agumon and Black WarGreymon:
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Successfully complete the game two times with two different 
characters. 

Gabumon and Omnimon:
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Successfully complete game with all default Digimon, Lopmon, 
and Black Agumon. 

Impmon:
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Complete the game with 300 or more D-Spirit, and having 
defeated Impmon. 

Lopmon and Kerpymon:
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Successfully complete the game with three characters (except 
the ones used to get Black Agumon.) to unlock Lopmon.