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Deals damage and has a 30% chance to confuse the target. In rain, this move has 100% accuracy. In sun, this move has 50% accuracy. This move can hit a Pokemon using Bounce, Fly, and Sky Drop.
Hurricane is an excellent move for rain sweepers. It is powerful and has excellent coverage, but poor distribution. Tornadus, Tornadus-T, and Dragonite are the best users of this move, which becomes 100% accurate in rain, but interestingly enough, Volcarona can use Hurricane as well. That said, Hurricane should not be used outside rain, as its accuracy becomes extremely unreliable.
Air Slash is a much less powerful but more accurate alternative.
Thunder is an Electric-type move which also gains 100% accuracy in rain.