Basically I heard the pokewalker is one of the easiest ways to level up if you do a lot of walking day by day. However I also read on bulbapedia that Pokemon levelled up on the pokewalker are weaker than Pokemon not levelled up on it because they get no ev's from the pokewalker.
So I'm was wondering if this is a good strategy--> Level up your Pokemon to level 100 with the pokewalker on HG/SS, then transfer them to black and white (because your ev's still go up on B/W at level 100 and they don't on HG/SS) and do ev training there and use protein, calcium etc to get there ev's up.