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Sandygast is a Pokémon formed from sand. It is mostly a mound of sand with a tunnel through the middle for a mouth. Above its mouth is a small depression where its eyes are located, and a small plastic shovel is stuck blade-first into the top of its head. On either side of its main "body" are two smaller mounds reminiscent of stubby arms.
Sandygast is born from grudges that seep into the sand, such as from Pokémon that suffer defeat in battle. It can suck the life force of people or Pokémon through its mouth. Apparently in the Alola region, sticking a hand into Sandygast's mouth is a way of proving one's courage. If a person grabs Sandygast's shovel, it will be able to control them; it uses this power to make children add sand to its body so it can become bigger. A Sandygast that loses its shovel may replace it with something like a branch or a flag, but it is said to keep searching for its lost shovel.