Grimer

Even though Grimer's Poison typing and Sticky Hold ability let it switch in on Fighting-types, as it resists their STAB attacks and does not risk losing its item, Trubbish does the same thing but better because of its higher Speed, access to entry hazards in Spikes, and repeated Berry Juice recovery with Recycle. Other bulky Poison-types like Foongus and Mareanie use their secondary typings to not completely fall flat to Diglett and to pivot effectively with Regenerator, respectively. Lastly, Alolan Grimer completely overshadows Grimer as a bulky Poison-type because of its Poison / Dark typing, granting only one weakness and having exclusive access to moves like Knock Off and Pursuit to effectively trap Abra and Gastly.