Mismagius

A lot has changed since the beginning of BW UU, and Mismagius finds its old niches taken up by newer Ghost-types. Cofagrigus or Sableye make better spinblockers and bulky Ghost-types, the former thanks to a significant bulk advantage, and the latter has the ability to effectively stallbreak by having priority on moves such as Will-O-Wisp, Recover, and Taunt. Mismagius holds on to the small niche of a fast setup sweeper, which no other Ghost-type can do as effectively. That's not Mismagius's only advantage. It has the ability Levitate, which when combined with Ghost typing, gives three immunities for potential free switches and set up attempts. Thanks to the consequential Spikes immunity and the lack of Stealth Rock weakness, Mismagius is the most hazard-resistant Ghost-type in UU. While hazard stacking teams make Cofagrigus's life hard, Mismagius will never have to lose more than an eighth of its health to hazards. It might not be as solid of a counter as Cofagrigus is, but Mismagius can still check powerful Fighting-types like Heracross and Mienshao with its immunity to their STAB, while still providing an offensive presence.