Sun
 Born from a sand mound playfully built by a child, this Pokémon embodies the grudges of the departed.
 Moon
 It takes control of anyone who puts a hand in its mouth. And so it adds to the accumulation of its sand-mound body.
 Ultra Sun
 It likes the shovel on its head, so Sandygast will get serious and fight any children who come to take it back.
 Ultra Moon
 If you build sand mounds when you’re playing, destroy them before you go home, or they may get possessed and become Sandygast.
 Sword
 Grudges of the dead have possessed a mound of sand and become a Pokémon. Sandygast is fond of the shovel on its head.
 Shield
 Sandygast mainly inhabits beaches. It takes control of anyone who puts their hand into its mouth, forcing them to make its body bigger.