Muk

Muk: THE tank. With high natural bulk, usable offensive and defensive typing, good Attack, and low Speed, Muk is the pure definition of a tank in the RU metagame. While it's outclassed as an offensive tank on balanced and offensive teams, Muk does have a niche on full stall teams by combining a bunch of various roles into one Pokemon. Muk's unique traits allow it to perform as a Trick and Toxic Spikes absorber, Toxic spreader, Rotom-C counter, and Durant, Escavalier, and Qwilfish lure all in one Pokemon. Muk is a formidable specially defensive tank, but its Defense leaves a lot to be desired and it's easy enough to take out due to its lack of reliable recovery. In most situations, Qwilfish is a better Poison-type for defensive teams thanks to Intimidate and its access to Spikes, Toxic Spikes, and Thunder Wave, but if the roles described before are needed in one teamslot, Muk is your Pokemon.