I've probably said this before, but bears repeating: Gardevoir would easily be the least interesting of its line in Smash. It just has a regular human body with a weird dress-like membrane(?), so there isn't much to distinguish it from a Zelda or Peach in terms of non-special moves. Kirilia; Gallade; and Ralts on the other hand could all some crazy moves with their twirling tutu-like shape; razor hands; and psychic-powered clumsiness respectively.