Where do you fight bass in Megaman bttle network 3 blue

You can fight Bass all over the place. Really: Undernet 3, what I can only describe as the "Alphanet," and Secret Area 3. He is invincible in the first location however, and only the final one will yield a chip (Bass+ for 550 damage woot! It's in an awful code though . . .). To fight this final version, feed the bugfrag trader in Secret Area 3 300 bugfrags and jack out. Then jack back in and return to the trader. And suddenly . . . the epic music of a cutscene begins . . .