What is Pokérus and how do Pokemon get it?

My Pokemon have had it before, but what is it?

Pleaselog inorregisterto add a comment.

Pokerus, is short for Pokemon Virus which is transmitted to your Pokemon via:

As you can see, on my Bronzor is affected by PKRS (Shorter for Pokerus).Pokerus doubles the EV’s that you get, and many people including me like to use it for ev training with a Anklet or something.

http://bulbapedia.bulbagarden.net/wiki/PokéRus^That website covers a lot^

Pokérus has a 3 in 65,536 chance of being generated on a Pokémon, either wild or bred.

Nurse Joy’s comments

“Your Pokémon appear to have tiny life forms stuck to them.Your Pokémon are healthy and seem to be fine.But we can’t tell you anything more at a Pokémon Center.”

Professors Explanation

“Hello, ?I discovered an odd thing.Apparently there’s something called Pokérus that infects Pokémon.Yes, it’s like a virus, so it’s called Pokérus.It multiplies fast and infects other Pokémon too. But that’s all.It doesn’t seem to do anything, and it goes away over time.I guess it’s nothing to worry about. Bye!”

http://pokemondb.net/pokebase/29979/what-does-pokerus-do-to-a-pokemon?show=29980#a29980

You get it from attacking Wild Pokemon who have it, or by spreading the virus in your party.