Is there an easy way to obtain Pokérus?
Solution 1:
You can ask for help on several forums, I usually use Neoseeker.
Pokerus is really common in the metagame, so if you post a request asking for an "infected" pokemon you'll get one easily.
Or you can spend a couple of hours with Wonder Trade, it's not rare to recieve an infected pokemon. Several trainers trade infected pokemon to help newbie ones.