I think you mean 252/252/6? 252+252=504+6= 510. Even though the other two wont hurt much, get them in one of your 252 stats, if im correct, it'll give 1 more point to it, 252 + 2= 254/4 = 63.5
Instead of 252, which is 2 Evs less and is although half a point, will make a slight difference. Trust me.