Braviary

Braviary has well-rounded stats that give it a few good traits like a decent Speed tier, a massive Attack stat, and the ability to create 101 HP Substitutes, which are important for its main set. Coupled with its high Attack, it also has strong neutral coverage provided by its STAB moves alongside some additional tools such as Superpower and Roost. It is one of the best stallbreakers, since very few Pokemon on defensive archetypes can break through its bulk or are faster than it. Defiant gives Braviary the ability to pressure Defoggers, a trait not many Pokemon have, making it great for teams that employ Spikes stackers. Unfortunately, offensive sets are worn down easily because of Brave Bird recoil and Stealth Rock. Braviary also has overlapping weaknesses with other hazard removers, putting some strain on teambuilding. Defensively, Braviary doesn't have a good set of resistances, so it can't be sent out easily without good prediction. It's also weak to common revenge killers such as Jolteon, Aerodactyl, and Sneasel. Finally, Pokemon it otherwise sets up on can run moves to bypass it, like Toxic Diancie and Thunderbolt Registeel.