You can't get the TM 28 back (dig) (this is just so you dont have to look all over the map to get it) (like I did)
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Dig is TM 28.
You can find TM Dig at the Ruin Maniac Cave.
There is no TM called Tombstony... TM 28 is Dig.
You go to fallarbor town, enter the fossil maniacs house and talk to his sister who gives you the dig tm.
get on the other side of the fence and go as far left as you can, and then down. you will find the TM dig