Mawile

Mega Mawile is one of the strongest wallbreakers in the OU metagame. Solid coverage options like Knock Off, Ice Punch, Fire Fang, and Thunder Punch alongside a setup move in Swords Dance make Mega Mawile impossible to deal with defensively, while its access to Sucker Punch gives it the ability to threaten offensive teams. Its typing, combined with Intimidate, grants it many opportunities to either set up or just attack against common Pokemon such as Clefable, Tapu Bulu, and Tornadus-T, allowing it to punch holes in teams relatively consistently. However, because of its very poor Speed, Mega Mawile heavily relies on Sucker Punch to deal with faster threats, which allows Pokemon like Tapu Koko, Tapu Lele, and Ash-Greninja to revenge kill it relatively consistently; hence, it struggles more against offensive teams that can overwhelm it before it can get a strong hit off. While Mega Mawile's typing is great, it does give Mega Mawile two weaknesses to extremely common types, namely Ground and Fire, making it vulnerable to common Pokemon such as Heatran, Landorus-T, and Garchomp, which are also bulky enough to take a +2 Sucker Punch. Finally, Mega Mawile has slight issues with picking correct coverage, as it can't always run what it wants.