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Sandslash is the Hitmonchan of Ground types, if Hitmonchan had a faster, stronger dual typed clone that did everything it did except better (like if Infernape got Rapid Spin)
Signature moves/abilities seems to be Game Freak's new MO (I think literally every Gen VII line had something unique to it, be it typing, move or ability) so they need to give it something unique that also makes use of its mediocre stats.
You could start with +55 BST to bring it in line with Ninetales instead of slumming it down at 450 with its old counterpart, Arbok.
