Originally Posted by Kid_Eternity
I have a question, if a pokemon's stat is maxed out with a Vitamin, does it still need to take EVs from a pokemon of that particular stat, for example, I max out the Sp. Atk of a Modest Pikachu, just the Sp. Atk ok? Does it still need EV's from Sp. Atk Pokemon?
No, Vitamins only work on a stat until that stat has 100 EVs in it. So a UT pikachu could take 10 vitamins. A pikachu with 40SpAtt EVs from training could only take 6SpAtt Vitamins. You need to do the final 152 EVs yourself.