I actually got my first one from pokemon black and it was on my lillipup then I caught another pokemon then I put that pokemon in the pc now i have a lot of pokemon with pokerus and my second pokemon who had pokerus was in pokemon white2 and it came from an eevee I caught in the garden in castelia city and I didn't know until I got to nimbasa because I don't pay attention to what nurse joy says so now I got pokerus in only gen 5 I guess which is why it is the best to me ^-^