No, you can EV train at any point regardless of your Pokémon's level.
For more information on Effort Values which is used for EV training, please see below for the Related Link.
black city or white forest
You should train your Pokemon until they strong enough to challenge the elite four, train your Pokemon from 50->70... if you catch one lengendary Pokemon that's will be perfect!But you just only catch kyogre!
Keep battling the Elite Four it really trains your Pokemon!! That's how I train my Pokemon. Either that or an Action Replay, which I have...
the elite 4
Train Your Pokemon- (Train till level 60 above,sure can one)
train your Pokemon that's it.
elite 4
You need great Pokemon. Train around a little on the Elite Four before challenging Cynthia. P.S. I spelled Cynthia right.-
train pokemons enough to beat the elite four and then give the Pokemon that you want to train 'exp. share' until it can fight on its own.
The best thing to do is to continue to go through the elite 4 and give that Pokemon the exp. share.
yes, you can.... it will take forever though.....
train