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Summons hail for 5 turns. If the user is holding the item Icy Rock, it lasts for 8 turns instead. Does 1/16 damage to all Pokémon except Ice types and those with the Snow Cloak ability. Blizzard is 100% accurate (and has a chance to hit through Detect and Protect equal to 100% minus the accuracy against a non-Protecting opponent). Moonlight, Morning Sun, and Synthesis heal 1/4 of the user's maximum HP.
Sandstorm is a sandstorm equivalent.
Sunny Day is a sunny equivalent.
Rain Dance is a rain equivalent.