No,to EV train you need to win experience points,try breeding your lv 100 Pokemon and EV train him.
I thought it would be informative to add that you can give the level 100 Pokemon 10 of each vitamin in five stats and 1 vitamin on the sixth stat. Sorry but that's the best you can do.
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You need to EV train your pokémon and use good movesets.
Train it as you train all pokemon.
It's pretty obvious... EV train (I suggest EV Training in Defense)...
just train
If you mean a high level like 30+ then yes but if 65+ i dont think it would be necessary.