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Spread it to a useless pokemon, store it in the PC so it doesnt go away. Take it out when needed so it spreads onto a pokemon you want to EV train/Super Train.
Pokerus doubles EV's you get from Super Training. So this would now be the best possible time to Super Train that mofo even if youre going to probably not use him ever. If you do plan on wanting to EV train that thing, might want to bank it so you dont have to waste another 3 hours training that thing, since itll get double EV's with it currently. Up to you.
