Dream World OU:
Abomasnow -
Alakazam -
Azumarill -
Blissey -
Breloom -
Bronzong -
Cloyster -
Conkeldurr -
Darmanitan -
Deoxys-S -
Ditto -
Dragonite -
Espeon -
Excadrill -
Ferrothorn -
Forretress -
Garchomp -
Genesect -
Gengar -
Gliscor -
Gorebyss -
Gyarados -
Haxorus -
Heatran -
Hippowdon -
Hydreigon -
Infernape -
Jellicent -
Jirachi -
Jolteon -
Keldeo -
Landorus -
Latias -
Latios -
Lucario -
Magnezone -
Metagross -
Mew -
Ninetales -
Politoed -
Porygon2 -
Reuniclus -
Rotom-W -
Sableye -
Salamence -
Scizor -
Scrafty -
Serperior -
Skarmory -
Slowbro -
Starmie -
Swampert -
Tentacruel -
Terrakion -
Thundurus -
Tornadus -
Toxicroak -
Tyranitar -
Vaporeon -
Venusaur -
Victini -
Virizion -
Volcarona -
Whimsicott -
Wobbuffet -
Zapdos -
Zoroark -

Credit to Ciele for making this threat list.