Klefki

Klefki's vast support movepool with access to moves such as Spikes, Thunder Wave, dual screens, and Fairy Lock in tandem with its Prankster ability allows it to reliably set up entry hazards and shut down fast Pokemon such as Mega Aerodactyl and Mega Sharpedo. It also has a great defensive typing in Steel / Fairy with only two weaknesses, matching up well against common Pokemon such as Hydreigon, Sylveon, and Crobat. Given its unique utility, Klefki is best used on offense or balance teams to lay entry hazards and provide a catch-all check to faster threats. Klefki also finds itself incredibly flexible with moveslots, as they can be tailored to fit the team's needs. However, Klefki possesses incredibly mediocre stats across the board, largely forcing it to rely on its typing to stomach hits and leaving it more passive than it would prefer if it's not running the ideal moveset to deal with a given Pokemon.