Nidoking

Nidoking's access to a great pool of Sheer Force-boosted coverage options such as Ice Beam, Flamethrower, and Thunderbolt allows it to deal heavy damage to defensive Pokemon like Zapdos, Toxapex, Tapu Fini, Landorus-T, and Tangrowth. Its great typing combination grants it immunities to Electric-type attacks, Thunder Wave, and Toxic and lets it absorb Toxic Spikes, something most wallbreakers in the tier cannot do, thus giving it a defensive niche. However, it must compete with stronger or faster wallbreakers in the metagame like Kyurem-B, Hoopa-U, and Mega Charizard Y, and its mediocre bulk and Speed tier make it vulnerable to fast offensive threats like Greninja, Garchomp, Tornadus-T, and Tapu Lele, which doesn't help much in that regard.