pokemon white pokemon levels

why wont my pokemon level up at all? I have used the same pokemon for more than 5 battles and it doesnt gain any exp points or any new attacks its just stays put at lvl 5 and getting my butt kicked by my 2 other ppl i have to battle with and their pokemon levels keeps raising up..does anyone know how to fix this? and anyone else run into the same problem?

Replying to #1

were trying to keep this to a single thread, i'll PM you with assistance, and i'll need more info, reply to the PM i send you.