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Fire-type attacks deal 50% damage against the wielder, and burn damage is 1/16 maximum HP per turn, rather than 1/8.
Taking half damage from Fire-type attacks is a situational ability, but could be a real life-saver for Pokemon that are normally weak to Fire. As it is, the only Pokemon that have access to Heatproof are Bronzor and Bronzong, both of which would much rather make use of their other ability, Levitate, which gives them an immunity to the more common, and arguably more dangerous, Ground-type moves and Spikes. However, Heatproof could allow them to get a surprise KO on Fire-type Pokemon that would normally easily take them out, such as Infernape or Darmanitan.
Found in Dream World