Question

When EV training in double battles do power items activate twice?

Answer 1

No, they don't because I have experience from hordes. For example when I battle 5 Pokemon at once which all yield 1 EV each, I would get 5 EVs but the amount will only be doubled once not 5 times or twice in your case.

Source: Experience from battling hordes.

Comments

thanks, I probably should have been more clear, I meant if I was holding the power belt  for example would I gain just the usual 4 extra EVs or 8, but I'm pretty sure this answers my question.

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also, you mean EVs right?

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Yes... I miswrote it...