Pinsir

Completely outclassed by Heracross, due to a lack of Megahorn, worse defenses overall, and no double STAB, if you ever feel like using it in OU. But Pinsir is a great UU Pokemon. It hits hard and fast, doesn't have that prominent 4x Flying weakness that Heracross has, and has got a great movepool. Pinsir suffers the most from not having a decent STAB attack, but, with the element of surprise backing, he can be a worthwhile investment. It has the advantage of not being walled by Solrock, and has a likely 2HKO with Rock Slide or Brick Break on Walrein with a Choice Band set, same for Return on Gligar, which are the 3 main physical walls used in UU. The Swords Dancer also has the ability to set up on almost anything in a UU team, and Solrock can't come out to try and abuse your weakness to Rock due to the threat of Hidden Power Bug.