Give Gardevoir Magic Bounce, a Gardevoir version of Soul Dew (Emotion Orb...?) that raises Sp.Atk and Defense (Instead of Sp.Def) and this move: Black Hole BP:80 PP:5 Type: Dark Priority move Special Description: Sucks the foe into a Black hole, damaging it and erasing any stat changes. (Has a %10 chance of causing a distortion to lower the foes accuracy by 1 level.) Dunno if this would make her OU, but would certainly help IMO.
I would say Victreebel or Medicham, but they're both good enough to do at least okay in OU. All they need is a little more speed, especially Victreebel because he's outclassed by Venusaur in OU, primarily because of his lower speed.
Official Zangoose of the Pokemon X board+Only member of my one-man team 3DS FC: 3609-1237-6725