Fallout summons a Nuclear Fallout onto the field for five turns, dealing damage every odd-numbered turn to all Pokémon except Nuclear- and Steel-types. This damage is based on each Pokémon's weakness to the Nuclear type, much like the damage taken from Stealth Rock or a Thunderstorm.
Damage (Max. HP)
Nuclear Fallout also increases the accuracy of Expunge to 100 and reduces all weaknesses of Nuclear-type Pokémon (intended to be by 25%).
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