Does Pokerus affect Pokemon with maxed out EVs?

So I got really lucky yesterday a got a Cresselia through trade that just happened to have Pokerus! So I’ve been spreading it to the rest of my Pokemon and its just great. However, if a Pokemon’s EVs are already maxed out, will Pokerus still double the stats, or will it have no effect?

Pleaselog inorregisterto add a comment.

Pokerus does NOT double your stats, otherwise it’d be a huge thing in competitive, which it isn’t. Pokerus will only double the amount of EVs your Pokemon obtains through battling while it has it. The maximum amount of EVs a Pokemon can obtain is unchanged whether or not they’ve had Pokerus. What Silemarine said is only partially correct. While Pokerus does only last one to four days, it does go away. It is not permanent in itself. After the one to four day waiting period, the Pokemon will be “cured” and will be immune to Pokerus from that point on.

Also, finding a Pokemon with Pokerus in the wild is more rare than a shiny Pokemon, even without shiny charm. The chances of finding one in the wild is 3 / 65,536, or 1 / 21,845. The smallest chance of finding a shiny Pokemon is 1/4096 in generation 6.

One more thing to note, however, is that that Cresselia might be hacked. I’m not sure whether or not you would care, since it can’t harm your save file in any way, but if it has 6IVs, Pokerus, and came from trade, then I’d say there is a large chance that it is hacked. Or at least a clone. Either way, the Pokerus you’ve received from it won’t make any of your Pokemon illegitimate just because it came from a hacked source. At least in my opinion, there is a large majority who might disagree but…

Source:

Yes, pokerus always doubles the stats for two weeks (that’s how long it lasts)