Scizor

With an incredible 130 base Attack, a Technician Bullet Punch, and a potent STAB-boosted U-turn, Scizor is definitely a force to be reckoned with in the OU metagame. Its Bug / Steel-typing gives it a whopping ten resistances with only one weakness, which enables it to answer Pokemon like Gengar, Latias, Metagross, Bronzong, Tyranitar, Starmie, and Dragonite. It is capable of revenge killing, scouting, and even sweeping teams with the help of Swords Dance.

That said, Scizor has its fair share of flaws. Entry hazards are especially devastating, as Scizor needs to be decently healthy to reliably switch into what it's supposed to check. Magnezone can consistently trap and remove Scizor with Hidden Power Fire, as it can often catch it on a Choice-locked Bullet Punch or while it sets up with Swords Dance. Its 4x weakness to Fire-type attacks means that it can often be KOed by a surprise Hidden Power Fire and Pokemon like Jirachi, Zapdos, and Infernape can force it out easily.