Hariyama

Hariyama fills a very exclusive niche in UU as one of only two bulky Fighting-types. Packaged with excellent base 144/60/60 defenses, an auspicious typing, and Thick Fat to provide a most fortunate set of resistances, Hariyama makes for an excellent tank, checking a variety of threats while simultaneously dishing out the hurt with his potent Fighting STAB. Access to Guts only makes Hariyama that much more dangerous, and he's more than capable of going on the offensive with moves such as Close Combat, Stone Edge, and Payback. Not to mention his awesome base 120 Attack stat, which is one of the highest in the tier.

Unfortunately, it's not all cyanide and happiness for Hariyama; as with any Fighting-type in UU, he's faced with stiff competition. Hitmonlee and Blaziken, though lacking the same amount of bulk, are significantly faster than Hariyama, and often leave him in the dust when there's a spot for a more offensive role. Similarly, Hitmontop's access to Rapid Spin, Intimidate, and myriad priority moves also has Hariyama faltering on the defensive and supportive side. Regardless, in the face of his rivals, Hariyama is still a most formidable, most threatening, and most unique Pokemon, so one would be wise to prepare for him whatever the case.