Beedrill

While regular Beedrill has mediocre Speed, this is remedied when it Mega Evolves. Mega Beedrill also has an amazing Attack stat, which is one of the highest in the STABmons metagame, as well as great coverage with Drill Run, and it hits incredibly hard with Adaptability-boosted U-turn and Gunk Shot. Moreover, while U-turn isn't the strongest Bug-type move, it helps Mega Beedrill's team gain momentum easily and is a good utility move, as is Knock Off. Sadly, Mega Beedrill has lackluster bulk, which means that it's easily KOed by everything and loses to priority, especially Fake Out + Extreme Speed. It is also a Mega Evolution that offers little to no defensive utility, and its weakness to Stealth Rock leaves it worn down quickly and is dentrimental to its role as a pivot. Not only that, Mega Beedrill also faces competition from Mega Scizor; however, while Mega Beedrill is weak to Stealth Rock and has to waste a moveslot on Protect, it has better Speed, can easily gain momentum with a fast U-turn, and its Poison-type STAB and larger range of coverage make it a good option.