thats incredible. i got my pokerus carriers in a wonder trade. is there a chance they could be duped?
Of course there's a chance, but I doubt them having Pokerus is cause to believe so. Once you have Pokerus it's easy to spread it among your other Pokemon.
Yes, I should clarify. It's rare to get Pokerus in the wild or from hatching, once you've got it it's trivial. Especially when you're trading online it's very easy to get because of how easy it is to spread around.