Yes, pokerus

[MithosFall]

Ok, I know what the pokerus is, what it does, and all that.

What I want to know is if the doubling ev points effect stays with the pokemon after it becomes immune.

I've looked on different sites and am seeing contrasting ideas.

 

[NiKaNoRoU]

As far as I'm concerned, the EVs will continue to be doubled, you just lose the ability to infect other pokemon with it.

 

[Ev Trainer X]

I've done a lot of training with pokerus, and I can confidently tell you that the doubling effect continues even when pokerus goes away. You just can't spread the pokerus from that Pokemon anymore.

 

[Tori]

as stated above is pretty much correct. you can even quadruple it with a macho brace but it will only affect said pokemon which was cured of pkrs