Guilty Gear X - Platform: Gameboy Advance

Unlock Testament:
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Defeat Testament when he challenges you in stage 9. 

Unlock Dizzy:
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Defeat Dizzy when she challenges you in stage 10. 

Original mode:
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Successfully complete the game in survival mode to unlock the 
"Original Mode" selection at the options screen. 

Extra mode:
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Defeat a fighter's dare devil version in survival mode to unlock 
extra mode for that fighter. The fighter's extra version is able 
to execute new moves and supers. 

Fight as Dizzy or Testament:
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Press Down, Right(2), Up, Start at the "Press Start" screen. 

Alternate costumes:
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Press Start or Select when choosing a fighter at the character 
selection screen. 

Guilty Gear mode:
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Select survival mode. Get to stage 180, then continue on and defeat
all opponents until reaching stage 330. The Guilty Gear versions 
will now be unlocked.