Banette

Mega Banette possesses the highest Attack stat in the current metagame, allowing it to function as an effective physical attacker. Between Knock Off, Will-O-Wisp, Shadow Claw, and its base 165 Attack, Mega Banette has very few counters and is therefore very good at breaking down defensive cores. Furthermore, its access to Knock Off and Shadow Claw makes it great against opposing Psychic-types such as Uxie, as well as Ghost-types such as Hoopa and Jellicent. Another reason to use Mega Banette is its ability, Prankster, which gives it priority on Will-O-Wisp and helps it against Dark-types and physical attackers in general. Prankster also works in conjunction with Destiny Bond and gives Mega Banette an effective way to KO opposing threats that may sweep, such as Virizion, Absol, Delphox, and Meloetta. Banette's movepool is also decent and includes moves like Gunk Shot, Sucker Punch, and Shadow Sneak. Mega Banette's Ghost typing allows it to work as a Fighting-type check for offense and a decent spinblocker. However, Mega Banette has a bad matchup against the main spinner in the tier, Blastoise, as it generally loses if Scald burns. Due to its lack of resistances, Mega Banette cannot switch in on many attacks. Furthermore, Mega Banette has an awkward Speed tier and mediocre bulk, and, as Prankster does not activate the turn of Mega Evolution, it can be hard to choose when to Mega Evolve.