@Red: Spend some time running around and battling with a PokeRus-infected in your party, and the others will catch it too. It won't spread in your PC, but the inflicted pokemon won't lose it in a couple days either. Heck, it won't lose it at all, lol.
@R8: Regi info:
http://www.serebii.net/platinum/regigigas.shtmlThe birds are roamers. Talk to Oak in Eterna after getting the Nat. Dex, and they'll start running around.

alright, thats what ive been doing, I have like 25 infected =]
the birds are annoying. I finally caught the zapdos and cresselia, and I still have moltres, articuno, and mespirt to catch. >.<