Virizion

While Virizion has a unique niche as a fast physical Grass-type with access to Swords Dance, it needs a lot of support to be effective. Virizion does threaten many common Pokemon, such as Suicune, Hydreigon, and Krookodile, with its STAB combination, but it lacks the coverage and power to deal with a large portion of the tier. Defensive Fairy-types, such as Florges, Sylveon, and Whimsicott wall it well, while faster threats such as Mega Aerodactyl, Mega Beedrill, and Crobat are common enough to revenge kill it. Celebi, one of the best Pokemon in UU, completely stops Virizion unless it runs X-Scissor, in which case Flying-, Poison-, and Bug-types can switch into Virizion with ease.