BlazeStrengthens Fire moves to inflict 1.5× damage at 1/3 max HP or less.
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Flash FireocultaProtects against Fire moves. Once one has been blocked, the Pokémon's own Fire moves inflict 1.5× damage until it leaves battle.
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Pokédex
Cyndaquil protects itself by flaring up the flames on its back. The flames are vigorous if the Pokémon is angry. However, if it is tired, the flames splutter fitfully with incomplete combustion.