Gligar

Gligar stands out in ADV UU as one of the best Ground-types and Swords Dance sweepers, being one of the most consistent punishers of the ubiquitous Kangaskhan's Rest. Gligar's Ground / Flying typing gives it a very good offensive and defensive profile. Many tier staples, such as Omastar, Arcanine, Tentacruel, and Ampharos, are weak to Earthquake; combine this with the fact that these Pokemon are commonly paired together, and Gligar can actively threaten a majority of team's defensive cores. Gligar separates itself from other Swords Dance users such as Scyther and Pinsir by being quite the apt physical hit-taker, not only with its good base Defense but also with its bevy of resistances and immunities as well as Hyper Cutter to block Intimidate from physical walls such as Granbull and Hitmontop.

However, Gligar's typing is a double-edged sword, making it 4x weak to Ice-type moves from the Electric-types like Ampharos, Electrode, Electabuzz it would ideally check otherwise. Gligar's measly base Attack also means its damage can be disappointing without Swords Dance boosts or a Choice Band, having trouble pressuring bulky targets without Spikes up. This means that even when Gligar can hit a foe super effectively, it has worse potential to trade damage when their response can OHKO it back, notably in the cases of Omastar, Ampharos, and Nidoqueen. While Gligar has a Speed tier atop many Pokemon, it isn't enough for other common offensive threats that can outspeed it, such as Arcanine, Scyther, Tentacruel, and Hitmonlee, making it more easy to offensively check.