Fields of Honor Alolan Vulpix .

When the player helps the Diglett Trainer find at least 20 Alolan Diglett, the player can get an Alolan Vulpix as a gift.

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

This gift cannot be shiny.