The Pokémon summons a hailstorm when it enters a battle.
Snow Warning is an ability introduced in Generation IV. So far, 4 Pokémon have this ability.
Snow Warning creates a hailstorm when the bearer enters battle. The effect lasts 5 turns (8 if the user is holding an Icy Rock, unless it is cleared via Cloud Nine or replaced by another weather condition.
If multiple Pokémon with weather-generating abilities (Snow Warning, Drizzle, Drought or Sand Stream) enter the field on the same turn, each weather condition will activate consecutively, fastest Pokémon first, so the remaining weather condition will be that of the slowest Pokémon.
Outside of battle
Snow Warning has no effect outside of battle.
Pokémon with Snow Warning