Celebi

Celebi is among UU's most potent sweepers and stallbreakers, as its decent offensive stats and typing allow it to force out several common Pokemon, such as Amoonguss, Hippowdon, and Primarina, in order to set up with Nasty Plot. Through the use of Z-Moves and its wide movepool, Celebi can also easily work around common means of counterplay. If running Psychium Z, it can power through common Grass-type switch-ins like Scizor and Mega Altaria. If opting for Grassium Z alongside Recover, however, Celebi can handle Blissey one-on-one while generally maintaining a solid combination of power and longevity, usually giving it a strong stall matchup. Further bolstering Celebi's prowess against defensive teams is its solid typing and uninvested bulk, allowing it to pivot in on several defensive presences, such as Slowbro, Quagsire, and Alomomola, as well as Natural Cure, which allows it to switch in several times due to its ability to circumvent Toxic poison and other status ailments. Unfortunately, Celebi's typing burdens it with as many common weaknesses as useful resistances, leaving it susceptible to tier staples like Infernape, Hydreigon, and particularly Scizor due to its 4x weakness to Bug, as well as to Pursuit from the likes of Mega Aerodactyl and Choice Scarf Krookodile. Pursuit is also found on several stall teams specifically to deal with Celebi, which can burden it quite a bit if it isn't careful. Celebi is also fairly weak to the tier's priority moves, taking super effective damage from Bisharp's Sucker Punch, Mimikyu's Shadow Sneak, and Mamoswine's Ice Shard as well as a hefty chunk from Scizor's Bullet Punch. Moreover, Celebi suffers from a merely decent Speed tier for an offensive Pokemon, allowing several faster threats with super effective coverage, like Gengar, Mega Manectric, and Nihilego, to easily revenge kill it. Lastly, Celebi's offensive prowess is good but not great, meaning that it often relies on Z-Moves to break bulkier targets and thus can be worked around with proper prediction.