Virus is a male Porygon who lived inside a very old computer that was infested with errors. The errors combined to make Virus. But every time someone knew used it, he would just make more errors, and no one, not even the greatest tech person, could get him out. Many people sold the computer, but more people would just get annoyed, so the computer ended up in an old antique shop in the electronic section. The owner of the shop had planned to trash the computer, but he just left it there. But no one ever purchased it because of how many errors Virus would cause.

But then you walked into the antique shop.