Shaymin in its Sky Forme will be appearing as a Prism Star in GX Ultra Shiny! The set releases in Japan on November 2nd.
You can’t have more than 1 Prism Star card with the same name in your deck. If a Prism Star card would go to the discard pile, put it in the Lost Zone instead.
[G][G] Flower Storm: 30x damage. This attack does 30 damage times the number of basic Energy attached to your Pokemon in play.
Weakness: Fire (x2)
Thanks goes to Franco T. for the translation!