Abilities, Slush Rush
2 species have Slush Rush as a hidden ability, 3 as a normal one
Of the 1,025 species this site covers, default forms only
SinceGen VII
Normal3
Hidden2
Elsewhere2
Effect, in PokéAPI's words
“During Hail, this Pokémon has double Speed.”
As a hidden ability
Arctozolt
ArctovishAs a normal ability
Cubchoo
Beartic
CetitanElsewhere in PokéAPI
2 more holders without a page here
Alternate forms and other species that PokéAPI lists with Slush Rush.
Sandshrew Alola (hidden), Sandslash Alola (hidden)