Xerneas, Yveltal and Zygarde glow while in battle. Xerneas apparently counts as a form change.
Oh, and speaking of resources, plenty of flying Pokemon that don't spend all their time flying appear grounded just in Amie. So Xatu looks retarded because of them fucking Sky Battles being hyped to death but being solely regular battles with limited choices in Pokemon and moves, with the side effect that some Pokemon have to be floating, and those who don't won't be able to participate in a sky battle despite levitating or shit.
Sky battles would be awesome if your usually grounded Charizard or Gengar took to the air and changed its idle pose to fight in one.