Abilities, Snow Warning
2 species have Snow Warning as a hidden ability, 3 as a normal one
Of the 1,025 species this site covers, default forms only
SinceGen IV
Normal3
Hidden2
Elsewhere4
Effect, in PokéAPI's words
“Summons hail that lasts indefinitely upon entering battle.”
As a hidden ability
Amaura
AurorusAs a normal ability
Snover
Abomasnow
VanilluxeElsewhere in PokéAPI
4 more holders without a page here
Alternate forms and other species that PokéAPI lists with Snow Warning.
Abomasnow Mega, Vulpix Alola (hidden), Ninetales Alola (hidden), Froslass Mega