I'm not entirely sure what you mean, but I think I got the gist of it. I'll use Reuniclus as an example. Reuniclus has great HP and SPA, decent Def and SPD, and low ATK, and pitiful SPE. This makes Reuniclus better suited for a bulky special attacker. You'll want to max out his HP and DEF, because HP gives him more healing from Recover and more Physical and Special bulk, and DEF because his DEF isn't boosted by Calm Mind, which all Reuniclus should use. You do not want to give it ATK or SPE EVs because they are very bad on Reuniclus and it doesn't use them. Now you have 6 EVs left to give. You need 4 EVs to raise a stat one point, so the leftover two are useless. This doesn't affect your Pokemon much, but you're better off putting them in SPD. Has this helped?