Trapinch can learn it at level 41, Vibrava however needs a TM
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it can if you teach trapinch dig before you evole it
Vibrava can either be taught Dig through TM28 or Trapinch can be stopped from evolving until level 41 so it can learn Dig and then evolve into Vibrava.
when it gets to lvl 40 or 41, Note that its trapinch who learns dig, not vibrava or flygon.
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.
Sandslash is the evolved form of Sandshrew. It is a ground type Pokémon. In the Pokémon Emerald version it learns dig at level 30.