Here some pokemon to beat elite four with at these level:

Swampert lv.59 mud shot,muddy water,surf,earthquake
Exploud lv.58 hyber beam,howl,headbutt, double team
gardevoir lv.59 psychic,calm mind,torment,barrier
blaziken lv.60 sky uppercut,rock tomb,overheat,blaze kick
armaldo lv.59 dragon claw,hyber beam,slash, sword dance
groudon lv.60 bulk up,fire blast,rest,snore

Thanx to me and CheatingDome.com you'll have good pokemon. :-)