Gliscor

With a unique typing that's only hit super effectively by Water- and Ice-type attacks, a large movepool, and well-distributed stats, Gliscor has risen to become a behemoth in OU. In fact, there is no Pokemon that can even come close to fulfilling the specific roles that Gliscor can fill. It is one of the most devastating stallbreakers in the tier, and it can utilize a scary Swords Dance set.

While Gliscor is an incredible Pokemon, its raw power is comparatively low, and its Special Defense is lackluster. Water-types will laugh at Gliscor's weaker attacks and give it massive trouble. Ice-type attacks are 4x super effective, and Gliscor is rarely able to take one from most opposing Pokemon. That said, Gliscor's shortcomings are very few. It can fit onto a large variety of teams and is an essential Pokemon in OU.