Vileplume

Vileplume is one of the premier physical walls in the NU tier. Its Grass / Poison typing allows it to resist common Fighting- and Water-type attacks from Mienshao, Breloom, and Basculegion. Vileplume excels in punishing foes for making contact, dealing damage with Rocky Helmet and spreading status with Effect Spore. Despite being a wall, Vileplume isn't completely passive; with Giga Drain and Sludge Bomb, it can threaten serious damage on Vaporeon, Sylveon, and Avalugg, and Vileplume can potentially poison foes with the latter. Leech Seed and Strength Sap further Vileplume's longevity and weaken checks like Registeel and Alolan Muk. Special wallbreakers like Dragalge, Chandelure, and Porygon-Z can easily overwhelm Vileplume. Defensive Steel-types such as Copperajah and Klefki that resist both of Vileplume's STAB moves wall it well but risk being worn down by Leech Seed.