No way the OU/Standard list has more than 20 members, check...
Blissey, Gyarados, Electivire, Dusknoir, Cresselia, Heracross, Breloom, Skarmory, Tyranitar, Rhyperior, Salamence, Vaporeon, Swampert, Heatran, Gengar, Starmie, Weavile, Manaphy, Jirachi, Garchomp, Milotic, Gliscor, Hippowdon...