It exhales air colder than -58 degrees Fahrenheit. Elderly people in Alola call this Pokémon by an older name—Keokeo.
– Pokémon Sun Pokédex
Alolan Vulpix is Ice type instead of Fire type. Instead of evolving with a Fire Stone, it evolves with an Ice Stone. It still has 6 tails, though they’re more clumped together than Kanto Vulpix, whose tails are more distinct.
In the anime, Lillie has an Alolan Vulpix named “Snowy” (“Shiron” in Japanese). It hatched from an egg near the start of the show.
The moves it learns via level-up mirror those learned by Kanto Vulpix, with the Fire moves replaced by equivalent Ice moves. While Alolan Vulpix is pure Ice type, it evolves into Ice/Fairy Ninetails. However, the only Fairy move it can learn by level-up or TM in Ultra Sun/Moon is Baby-Doll eyes. This was changed in Let’s Go Eevee/Pikachu, where it learns Dazzling Gleam by level-up and TM.
Stat-wise, it has the same stats as Kanto Vulpix, with good Sp Def and Speed.