Nope. It's just like giving it Rare Candies. The levels go up without EVs.
A lot of people, if they don't have the patience to get lots of Rare Candies with Pick-Up, will put their Pokemon into the Daycare for a while until it's at a high enough level that they can EV-train it against whatever.
No matter how you level up (Rare Candy, Daycare, battling) the end result will be the same. The only thing that will make a difference is what (if any) EVs it gains.