Defeating Bass
To Defeat Bass for Gregar, use the EraseCross.
Hit him with a Null Chip ( non-elemental) and he will have a bug that will drain his HP. After that, unleash your full power at him.
Occasionally, you should throw in an EraseBeam( EraseCross's Buster atack)
If you need more help, we've got more Mega Man Battle Network 6 Cybeast Gregar cheats and also check out all of the answers for this game
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