Great place to train lv 50 - lv 80 pokemon at? and hows my team?

Train against the elite 4 or go to route 11-15. Those routes have higher level pokemon (Up to lvl 67 I think). The giant chasm has lv1 65 pokemon in the double gr. Just equip your lucky egg and start beating wild pokemon. Usually I give the lucky egg/amulet coin to one pokemon and the exp. share to another and beat the league over and over until the exp. share pokemon is strong enough to take on the league by itself.