Quote originally posted by Ash493:
Wouldn't giving it Exp.Share and switching it once the battle starts be enough? :)
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Battling Audino from shaking grass well help very majorly with this as well. I'd also say to go in with the EXP. Share until it's a high enough level to battle other Pokémon/trainers without fainting very quickly, and afterward go in with the Lucky Egg.