Beat the fan enemies in Yoka ....1? The area with the heater in it. If you don't get it, just keep trying.
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http://tartarus.rpgclassics.com/mmbn4/walkthrough23a.shtml
The GameFAQ's site has a section for Megaman Battle Network 3 that includes multiple walkthroughs and FAQs and some cheat codes. SuperCheats has an extensive and well-organized list of cheats for the game, as well as tips.
the samw way you find him in Gregar , go to the undernet zero from green area ( examine the back of the big tree in green area 2 ) move around until you find Bass and defeat him , then go to the Graveyard and defeat Bass SP ( you need all the standered chips to battle him ). if you have already done this , just go to underground 2 , go to the plateform where you battle Falzar Beast megaman . you will battle Falzar Beast megaman SP first , then you will battle Bass BX .
You can find it where the navi who gives you c slider. Which you need an unclocker for ( The navi is in Sharo area where all the arrows are)
u can find them at this site http://www.gamefaqs.com/boards/genmessage.php?board=929993&topic=31803681&page=11