Ninjask can be taught TM28- Dig.
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If you level it up to level 45 you will be able to let it learn dig, but remember you'll have to delete a move to learn it.
At level 40 it will want to learn dig
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Sandslash learns Dig at level 30 in Pokemon X and Y. In Pokemon Omega Ruby and Alpha Sapphire, it can learn Dig at level 33.
It doesn't learn Dig through level up. You can, however, teach it Dig through TM.