BassGS

The final, final, ultimate boss in the storyline. There are a few things you'll have to do before you can challenge this guy:

Complete Job 19 and get the WWW-ID (to access the Mettaur family)

Collect all the normal Virus families into the Virus Breeder (to get past the Door of Love) (not including Scuttlst 2)

Defeat Serenade (to unlock BassGS)

Make sure you have 300 BugFrags to feed the Bugfrag Trader

All of which are included in other sections. Now, on with this:

Just past the entrance to Undernet 3, turn right. Exmaine the purple barrier. If you have collected all the Viruses like I said you should, it will open and let you pass.
	At the BugFrag trader in the middle of the room, continually feed in Bugfrags until you the screen shakes and your hear a different growl than normal.
Note: This Trader is totally random and therefore a fantastic if risky way to get the rest of the normal chips you've missed. You can easily complete your collection, provided you have the BugFrags.
	Walk out of the secret area and jack out of the server. You must jack all the way out.
Jack back in again and go back to the trader. Behold, the Destroyer is Manifest. Fight BassGS.

Well, you're now officially the strongest Navi/Operator duo in Cyberworld, and you've probably set up the scene for the next Battle Network game as well. Nice going.