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Deals damage and has a 100% chance to land a critical hit. Pokemon under the effect of Lucky Chant or with the abilities Battle Armor or Shell Armor cannot be critical hit but will take damage as normal.
While slightly weaker and less accurate than Ice Beam, Frost Breath is an acceptable alternative. It is useful for countering defensive stat boosters, as the critical hits ignore the boosts. However, defensive stat boosters are few and far between in the current metagame, lowering the need for Frost Breath.
Ice Beam is a more reliable attack with 95 Base Power, but doesn't guarantee a critical hit.
Blizzard is an alternative with 120 Base Power as well and has 70% accuracy, but doesn't guarantee a critical hit.
Storm Throw is a physical Fighting-type equivalent.