I finally collected some viruses for the Virus Breeder. Essentially, the Viruses you find on the Net get transferred here, and in here, you are able to take care of them. You can feed them BugFrags, which raise their attack power.
Basically, after talking to the SciLab scientist in charge of the Virus Breeder, he will develop a chip for you to use to summon Viruses to your aid during battle. The chips are time stopping chips, and you’ll basically get a roulette to determine which virus you’ll use to attack.
Chips are grouped based on Virus Families — so, if you wanted to use a Mettaur to attack, you’d use a Mettaur Chip, which would summon a roulette Mettaur… pressing A would determine whether Mettaur 1, 2 or 3 would attack.
It’s fun, and can be rather effective in battle. Sensor Viruses, IMO, are particularly useful.