on route 114, go inside the fossil maniac's house. his little brother will give it to you.
TM28 Dig in Pokemon R/S is on Route 114 inside the Fossil Maniac's house.
tm28= Dig: found at Route 114
Route 114
Route 214
Pokemon Ruby/Sapphire/Emerald = Buy another at lillycove department store. Pokemon Soul Silver/Heart gold = Buy another at Celadon city or Goldenrod city dep. store.
tm28 contains Dig
You get TM28 Dig from the Fossil Maniac's brother on Route 114.
National Park and its hard to get
You can get the TM28 (Dig) on Route 214 in the Ruin Maniac Cave in Pokemon Diamond.
Pokemon ruby's version IS Pokemon ruby.
Can be obtained by leveling up select pokemon. these include Diglett,Dugtrio,Nincada and Trapinch. It can also be obtained by using TM28 (found on Route 114)
Sandshrew learns Dig at level 30 in Pokemon X, Y, Omega Ruby, and Alpha Sapphire. It can be taught faster if you used the TM28.