Actually, I beat the elite four in one try with only four pokemon. I thank Sacred Ash and recover for that though.
Meganium
lvl 46
Cut, Synthesis, Razor Leaf, Body Slam
Umbreon
lvl 46
Bite, Shadow Ball, Quick Attack, Attract
Ho-Oh
lvl 45
Sacred Fire, Recover, Gust, Fly
Suicune
lvl 45
Bubblebeam, Waterfall, Gust, Roar