Pokémon #282 in the National Pokédex, a Psychic type Pokémon (Psychic/Fairy starting from generation 7).
Dangerously feminine, its top looks bob cut while its wiry body flows into an elegant "dress". Often further personified in fanart, it is precariously either gender in equal probability (read: otoko no ko).
With Gardevoirite it can temporarily evolve to Mega Gardevoir. As Mega Gardevoir its wiry body looks more akin to a wedding dress, and gains enhanced special attack and special defense stats along with the ability to convert Normal-type moves to Fairy-type moves.
Japanese name: Sirnight