Kingambit

Supreme Overlord, a high Attack stat, access to Swords Dance and Sucker Punch, and a wide variety of items and Tera types at its disposal make Kingambit one of the most dangerous late-game sweepers in the tier, being able to use Terastallization to lure in and beat Pokemon that would normally check it and completely take games at the drop of a hat. It also has an amazing defensive typing that lets it easily set up on metagame staples like Lunala and Necrozma-DM to start its sweep. However, the abundance of common Dark-resistant Pokemon in the tier makes making complete comebacks harder, as Pokemon like Koraidon, Zacian-C, and Arceus-Fairy, among others, can take a Sucker Punch and end its attempt at a sweep either by OHKOing it or burning it, though this can be circumvented with Terastallization. Kingambit is also forced into not coming in for the majority of the game, as it's heavily reliant on using up its HP or Terastallization to sweep, and when no teammates have fainted, it is weak compared to the rest of the metagame.