Pinsir

Mega Pinsir is easily one of the most dangerous setup sweepers in the Monotype metagame thanks to its amazing Attack, good Speed, and access to Swords Dance. It has a great ability in Aerilate, which makes all of its Normal-type moves become Flying-type while giving them a boost, making Return a powerful STAB move and granting Mega Pinsir an excellent priority STAB move in Quick Attack. Furthermore, Mega Pinsir has access to good coverage moves such as Close Combat and Earthquake to hit Steel-types like Heatran, Ferrothorn, Skarmory, and Bisharp, as well as Rock-type Pokemon like Tyranitar and Cradily. Its decent bulk lets it set up Swords Dance against most non-super effective attacks. However, Mega Pinsir's severe weakness to Stealth Rock heavily reduces its sweeping chances. It is also reliant on team support to break through its checks and counters. Mega Pinsir also has no form of recovery, which reduces its longevity even more. Furthermore, any type of status effect heavily compromises Mega Pinsir's sweeping capabilities.