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From the official website
>If you heedlessly grab a Sandygast’s shovel, you’ll fall under the Pokémon’s control. A Sandygast uses its power to manipulate children into gathering sand to increase the size of its body. If a Sandygast loses its shovel, it may put up a tree branch, a flag, or another item in its place. These Sandygast are wanderers in search of their own shovels.