Dugtrio

Dugtrio's sole purpose in Ubers is trapping Eternatus. With Special Defense investment, Dugtrio is able to take a Dynamax Cannon even after Stealth Rock, meaning it can easily dispatch Eternatus after coming in with a smart double switch, on a teammate's U-turn, or when Eternatus is forced to recover. Reliably removing Eternatus lets strong sweepers and wallbreakers such as Kyogre, Ho-Oh, and Marshadow wreak havoc. Additionally, your own Eternatus can increase the pressure of Toxic Spikes without opposing Eternatus to absorb it. Dugtrio's trapping ability also makes it generally useful for picking off weakened Pokemon, and it has some nifty utility options, such as Memento to give a party member a free turn to set up. However, Dugtrio is very weak and therefore struggles against more offensive builds, and it is generally outclassed by more powerful Choice Scarf users such as Calyrex-S and Galarian Darmanitan. It is extremely frail and relies on teammate support, double switches, and revenge killing to come on to the battlefield. As such, Dugtrio is an extremely niche pick that functions best on teams that are dedicated to sweeping once Eternatus is removed.