I know you need 252 Evs but I'm still learning evs
Actually, that's not it. You need:
If that is all fulfilled for one stat, that stat will be maxed out.
When you put 252 EV's into any Stat, that is when you put about 63 Stat points onto one Stat because of the EV's. You also need a beneficial nature and 31 IV's. Some items can help too.
This link should tell you ALL: http://bulbapedia.bulbagarden.net/wiki/Effort_values
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