Fields of Honor Alolan Marowak .

When the player helps the Diglett Trainer find at least 50 Alolan Diglett, the player can get an Alolan Marowak as a gift.

This marks the first time an Alolan Marowak can be obtained in Sword and Shield.
(This statement above excludes any kind of transfer via Pokémon HOME)

This gift cannot be shiny.