Aerodactyl

Aerodactyl is one of the fastest Pokemon in OU, letting it consistently set Stealth Rock while preventing Landorus-T, Garchomp, and Gliscor from doing so. This gives opportunities to Pokemon that are weak to Stealth Rock, like Volcarona, Cloyster, and Dragonite, to switch in and set up much more easily, making Aerodactyl a solid fixture on hyper offense teams. However, Aerodactyl faces competition from other Stealth Rock setters such as Garchomp, Terrakion, and Landorus-T, as they all have more set versatility and defensive utility, making them easier to fit. Garchomp and Terrakion can run Swords Dance alongside Stealth Rock to wallbreak while setting Stealth Rock, while Landorus-T can run Imprison to prevent Stealth Rock from slower leads and use Explosion to give Cloyster, Dragonite, and other partners a free switch.