Dig is a TM, so you can teach it to it at any level.
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Level 25.
Graveler is a common Pokemon that can be found on the first Basement of Victory Road. You'll need to use Rock Smash.
level 5
Swampert does not learn Hydro Pump.
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.