I don't even know if all ground types can learn dig or not but whatever. Call me a copycat if you want to
He already told about these, credit goes to him. > - Phanpy - Donphan - Barboach - Whishicash - Toterra - Palpitoad - Yamask - Mudbray - Mudsdale - Sandygast - Palossand - Runerigus
Apart from these,
Arceus-Ground Silvally-Ground
Also Zygarde-Complete is listed even though it learns Dig.
Here ya go: - Phanpy - Donphan - Barboach - Whishicash - Toterra - Palpitoad - Yamask-Galar - Mudbray - Mudsdale - Sandygast - Palossand - Runerigus
Source 1 Source 2 (/ds ground type,!dig,natdex)
Hopes it help!