ok, first off, ev train 252 attk and 252 speed, 4 hp.
i think u should change ur nites move sets because it is made for attking and u only got moves that aren't offensive. u should have outrage, avalanche, keep either roost or heal bell, cause otherwise ur over doing it. and the last move, give it something that is a physical and strong move.and u should give it choice scarf with outrage.
item: berry that helps weaken the power of ice