Pokerus spreading in Y?

Question

All my Pokemon have pokerus and I just started playing Y. Is this normal??

Answer 1

It's normal. Congratulations! You caught a Pokemon with Pokerus! Pokerus spreads like a flu during wintertime, infecting all of your Pokemon.

However, this is a good infection, as it doubles the EVs you gain (i.e. Magikarp giving 2 Speed EVs instead of 1) from wild Pokemon.

Pokerus is also rarer than a shiny Pokemon, having a 3 in 65,536 chance of being on a wild Pokemon.

It is cured over a period of about 2 days. Once it is cured, it cannot spread to other Pokemon (but the double EV effect remains).

Source

Answer 2

Yeah, Pokerus spreading in Pokemon Y is normal. Pokerus is a good thing as well doubling all the EVs it obtains, therefore it spreading is even better!! xD

Hope I helped. :)
Source: Experience