OoOo, you got a Sneasel? That'll come in handy aginst the Elite Four with its ice attacks. ^_^ (if only I had done the same DX ) Ya might have to have it evolve though for that.
I myself (in my top 6) have: Infernape Lucario Floatzel Gengar (from the Haunter in the trade) Chatot and Dialga
With all of them being in the early 50's in level. While I have Luxray, Pachirisu, and Roserade in the late 40's that I switch around from time to time.
I'm up to the E4 myself. But I'm struggling with beating the Champion, Cynthia. I've read in walkthrough's Azelf is the better of the psychic trio to have for them, so currently I'm trying to capture the annoying little bugger >___<