In the interview gamers.com had with the developers of G/S, they mentioned a (beneficial) viruse that your pokemon can catch. Although its very rare, has anyone encountered this viruse yet?
and you can find the interview at http://www.gamers.com/news/327356 in case you want to check it out.
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"There is no such thing as the Pika Cup"
- From the infinite wisdom of NoA.