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Deals damage and has a 10% chance to freeze the target.
Powder Snow's low Base Power makes it a really bad choice when looking for a good special Ice-type move. There are better choices available, such as Ice Beam and Blizzard, both of which have much higher Base Powers than Powder Snow.
Ice Beam is a more powerful option.
Blizzard is a much more powerful option that has lower accuracy, although its accuracy is perfect under hail.