my pokemon have pokerous

Well, in GSC it doubles EXP.
In next generations it doubles IVs gained.
And it fades over a day or two, but that only means it cant give it, it still have the functions.

You can't gain Iv. Iv is set when you first catch the pokemon. I think the word you're searching for is Ev right?

i think he/she does

I got it. Proly cause I played with Piplup's Swellow.
@ShinyUmbreon: My first shiny was a Zigzagoon. I named him pepper cause he was red.

Actually sanky, in GSC I'm pretty sure that it double EVs not experience. I had a sizor in my first gold version and it got pokerus, (back then I had no idea what it did so I had to do much research) and even then every website I had found said that it doubled the rate at which a pokemon's stats were raised. I may have misinterpreted it though, now that I think about it that kind of does sound like it could mean it only doubles exp. But I don't ever remember him gaining more exp than anyone else in my party.

Gravedig, but yeah you're right.

At least this time the person who dug up the thread had some useful input, which I don't mind at all.

Lese didn't gravedig at all. It's was Tabbey.

Nah, but I've hacked my Pokémon in Diamond using AR to have it.