EV Enhancers

[Orion X]

You mean like Power Bracer, etc. right?

Well, depending on the item, it'll give you 4 of that EV.

So, say you give your Pokemon the Power Anklet (Speed). So, if you fight and defeat a Gyarados, which gives 2 Attack, the Pokemon with the Anklet will get 4 Speed EVs and 2 Attack EVs.

If the holder has Pokerus, the 4 are added, and then the EVs are doubled. So, a Power Bracer + Gyarados + Pokerus will get you 12 Attack EVs.

Hope this helped.