Answer 1

No, Pokerus will not double the amount of EVs gained from Vitamins. Pokerus only applies when battling Pokemon. Here is a link with more info about the Pokerus:

http://bulbapedia.bulbagarden.net/wiki/Pok%C3%A9rus

The info about the Vitamins is at the top of the page.

Comments

thanks

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No problem.