Scizor

Bug

Scizor's useful Steel typing and access to a spammable Technician-boosted STAB move in Bullet Punch makes it a fantastic pick on Bug teams. Its Bug / Steel typing gives it a neutrality to Flying-type attacks and a resistance to Fairy-type moves, making it extremely valuable in those matchups. Likewise, it resists eight types, including Normal and Steel, and has decent natural bulk. This makes setting up Swords Dance much easier for it and lets it function as a pivot. Furthermore, Scizor has a great movepool that complements its ability Technician, with moves like Bullet Punch and Bug Bite being boosted. Bullet Punch, being a priority move, also lets Scizor check huge threats to Bug teams like Mega Diancie, Nihilego, and Tapu Koko in addition to making Scizor itself hard to revenge kill. Scizor doesn't lack in the utility department either, with moves like Knock Off and U-turn, a boosting move in Swords Dance, and reliable recovery in Roost. In addition to all this, Mega Scizor has great bulk and a monstrous Attack stat. Since Scizor can run many sets, it is often unpredictable, especially when paired with Heracross, as it can be difficult to tell which is the Mega Evolution. However, when partnered with Pinsir, it is obvious that Scizor is not the Mega Evolution. Unfortunately, Scizor has a crippling weakness to Fire-types, making it often useless against Fire teams. Its low Speed also means that faster Pokemon that resist Bullet Punch like Keldeo can easily switch in and revenge kill it. Mega Scizor faces a lot of competition with the other Bug-type Mega Evolutions. It is preferable to run Mega Scizor when the team has a reliable way of trapping Victini and taking on Water and Poison teams.

Steel

Mega Scizor's great Bug / Steel typing, which grants it a neutrality to Ground- and Fighting-type moves, combined with its great overall bulk and access to Swords Dance makes it a fantastic setup sweeper. Its bulk allows it to pivot into many threats to Steel teams like Mega Alakazam, Meloetta, and Alolan Raichu. Mega Scizor has a wide movepool that includes coverage options like Superpower and Knock Off and reliable recovery in Roost. It can also pivot with U-turn, supporting setup sweepers like Bisharp. In addition to this, Mega Scizor has access to a great Technician-boosted STAB move in Bullet Punch, which, being a priority move, makes Mega Scizor hard to revenge kill once it has set up. Between its defensive and offensive options, Mega Scizor is often an unpredictable setup sweeper. In addition, Mega Scizor can effectively run Facade to punish bulky Water-type Scald users like Mantine and Toxapex that try to cripple its regular sets. However, Mega Scizor has an extremely exploitable weakness to Fire-type moves, which means Pokemon carrying Fire-type coverage like Garchomp can easily take it out. Its Steel typing also means that Magnezone can trap it and take it out with Hidden Power Fire. Furthermore, Fire-types resist Scizor's STAB moves, making it next to useless in the Fire-type matchup. Mega Scizor also sits at a below-average Speed tier, which means it can be easily revenge killed by faster Pokemon that resist Bullet Punch, like Keldeo and Infernape.