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I assume you mean a Sand Rush Sandslash with either an offensive nature for sand teams or a defensive nature for anything else. There really isn't a reason for the ability if it isn't a sand team though, so just don't bother unless you intend to bring sand.
First, you need a female sandslash or sandshrew. Sandslash/shrew is in the Field egg group (if you don't know what that is look it up), so you will need another field egg group pokemon, or a ditto.
Tbh, thats all I can say because you didn't specify nature, ability, moveset, or anything really.
