I most definitely agree that the EV Training should be explained. If it's such an important mechanic in teh game, why in the hell do they not explain it?!?
Then again though, it's more important for online games...online games never explain the stuff you're actually expected to know. Come on, I know Pokémon can get away with not telling you what the "Current" metagame is, but PC games that're constantly updating...would it kill you to actually update it so newbies aren't cussed out for not knowing something that is never actually explained to them in-game?