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Snow
Snows heavily for five turns. All non ice-type, fire-type, or flying-type pokemon have their speed halved. All non ice-type pokemon's PP usage double and accuracy reduced by 20%. These effects last five more additional turns after it stops snowing.
extra shit:
If sunny day is used, accuracy lowers by another 20%.
Rollout becomes ice type. Ice Ball's base power doubles.
Avalanche base power doubles.
Frozen pokemon cannot thaw.