The Pokémon makes it snow when it enters a battle.
Effect
When this Pokémon enters battle, the weather is changed to snowstorm for five turns or until replaced by another weather condition. If the user is holding Icy Rock, this effect lasts for eight turns.
If multiple Pokémon with this ability, Drizzle, Drought, or Sand Stream are sent out at the same time, the abilities will activate in order of Speed, respecting Trick Room. Each ability's weather will cancel the previous weather, and only the weather summoned by the slowest of the Pokémon will stay.