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I've got a couple of questions about horde EV training:
1) Which Pokemon needs to be infected with Pokerus to double the EVs gained? Is it the Pokemon you want to EV train or the Pokemon that is killing the hordes?
2) Do power items only affect the EVs gained by the Pokemon holding it? Or if I was to give it to the Pokemon doing the battling, would every single Pokemon in my party get the extra EVs as well?