Nidoking

Thanks to its massive movepool and key resistances to Electric-, Fighting-, and Rock-type attacks, Nidoking is able to fulfill a role on nearly any team. Although it might seem outclassed by fellow wallbreaker Blaziken, Nidoking boasts the ability to single-handily dismantle the hugely popular Fire-Water-Grass core thanks to its diverse movepool. Nidoking's typing grants it immunities to both Thunder Wave and Toxic, allowing it to switch into the likes of Registeel and Chansey with ease, which is something Blaziken cannot do. If you need a Pokemon to break through walls, revenge kill, or sweep late-game, definitely consider Nidoking for a slot on your team, as it is certainly a force to be reckoned with in the UU metagame.