Anyone any idea's?

Where would be a good place to train my pokemon, I'm just about fight the 8th gym and i want to get some pokemon up to about level 40. Any idea's?

Well, you should train any pokemon , that knows any ice type moves, because Clair, a dragon type gym leader, has some pokemon with very good speed, so most pokemon cant survive a hit from her dragnairs.here is a tip: fire, water,grass and electric type moves are not very effective.I reccomend trading a onix with a metal coat or getting a magnemite, because Clairs dragon and normal type moves are not so effective against steel types.