Rhyperior

Rhyperior was made to be a tank. Its base 115 HP coupled with its Solid Rock ability, base 130 Defense, base 55 Special Defense, and access to Assault Vest makes it one of the bulkiest Pokemon in Battle Spot Singles. Its stellar base 140 Attack lets Rhyperior deal a lot of damage to Pokemon such as Mega Kangaskhan and Mega Salamence, hitting them with one of its great coverage moves including STAB Earthquake, Rock Blast, and Stone Edge, as well as Superpower and Ice Punch. Rhyperior completely counters physical attacking Mega Salamence, as Rhyperior takes little damage from Double-Edge and Earthquake. Rhyperior's great offensive typing grants it a STAB EdgeQuake combo; however, it is a lackluster defensive typing, as it gives Rhyperior six weaknesses, including common types such as Fighting, Ground, and Water. Rhyperior has a 4x weakness to Water- and Grass-type attacks, and although this is reduced to 3x damage thanks to Solid Rock, Rhyperior will still be OHKOed or 2HKOed by most of them, making it very weak to Pokemon such as Azumarill, Rotom-W, Mega Venusaur, and Breloom. Rhyperior's base 40 Speed stat makes it very slow, so it won't be outspeeding much, either.