Whimsicott

Blessed with the rare Fairy typing and an excellent Speed tier, Whimsicott makes for an excellent revenge killer and utility Pokemon. Whimsicott's unique typing allows it to beat many dangerous threats like Persian-Alola and Virizion. A powerful Moonblast and pivoting coupled with Choice Specs allow Whimsicott to break past bulkier threats like Orthworm and Glastrier. However, Whimsicott's low offensive stats leave it often wanting for power, especially without Choice Specs, and it's incapable of fitting every move it wants. Furthermore, lack of reliable recovery and only average bulk makes it unable to consistently check the Pokemon it's supposed to like Regirock and Sandaconda.