Sandstorm is a Rock-type move that causes a sandstorm that lasts five turns. If the user is holding a Smooth Rock, the sandstorm will last eight turns.
A sandstorm will damage all Pokémon that are not Steel, Rock, or Ground-type by 1/16 of their HP. Pokémon that are in the intermediate stage of Dig will not take damage during that turn. Synthesis, Morning Sun, and Moonlight will heal 1/4 HP. Rock-type Pokémon will have their Special Defense raised by 1.5× while a sandstorm is present.
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