Garchomp

Garchomp is arguably the best Dragon-type available in Dream World OU; its only drawbacks are a lack of Dragon Dance and ability to go mixed. Its STAB coverage is absolutely superb: not only does it get neutral coverage on all but a handful of Pokemon, but Garchomp also has powerful STAB moves and a high Attack stat to back it up. All of Garchomp's stats, sans Special Attack, are great. Its Speed tier isn't the highest, but it's still quite good, and allows Garchomp to occupy a relatively high Speed tier amongst Choice Scarf users when it dons said item. Garchomp's bulk, Speed, offenses, and neutrality to Stealth Rock all make it a terrifying sweeper to face. It is especially threatening when used on sand teams, as sand allows Garchomp to utilize its trademark ability: Sand Veil. Garchomp does have its issues, such as being outsped by a good portion of the offensive metagame and having a 4x weakness to Ice-type moves, but Garchomp is still a superb Pokemon, and it isn't difficult to see why it was banned from OU in DPP.