And to answer how to tell if it's maxed, just try to train it in speed and attack. If it doesn't work then you know that those stats are maxed. Then train it in the stat you want to have the 4 EVs and use at least a +8 regimen. If you gain +6 then you're good. If you gain +2 then there's a whole process you'll need to go through ... You don't need to redo the whole thing, you can just use an EV Berry, but this is already a long comment so just tell me if that's the case and I'll leave more instructions.