Klefki

Klefki may not seem like much, but it has an excellent ability in Prankster and the movepool to take advantage of it! Klefki is most notorious for its use of a Swagger set, which may be the most irritating to face in Pokemon history due to its uncanny ability to hax its way to victory! Swagger isn't all Klefki is good at either, as it has access to other good support moves such as Reflect, Light Screen, and Thunder Wave as well as an excellent typing that gives it key resistances to Poison-, Flying-, Ice-, Normal-, and Dark-type attacks and an immunity to Dragon-types.

Klefki's most notorious luck-dependent utility may in fact be its greatest flaw in the long run. Swagger can easily backfire when used against strong, physical switch-ins such as Garchomp and Landorus-T and proves to be fairly ineffective against stall teams due to Klefki's lack of reliable recovery. Klefki's overall stats are fairly mediocre, reducing its niche to prankster support and rolling the dice with Swagger. Because of these flaws, Klefki isn't a particularly reliable Pokemon, so it simply isn't something a trainer can slap onto any team without proper support. Still, it's hard to deny that Klefki's ability to take advantage of luck can make it extremely dangerous to face, so it should never be underestimated.