That TM is given by a kid in the fossil maniac's house which is west from fallarbor town.
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you can get 28 dig on route 114
Dig is a TM, so you can teach it to it at any level.
you can't buy it,but you can get it in fallarbor town in one of the houses with tunnels
TM28 Dig in Pokemon R/S is on Route 114 inside the Fossil Maniac's house.
you get it on route 114. there is a house to the north, and if you talk to the kid next to the hole he will give you the TM