Flash Fire

 is a Pokémon ability introduced in the third generation. It causes fire moves to power up the user.

Description
Pokémon with Flash Fire are immune to Fire attacks. If they get hit by a Fire-type attack, they get a 50% increase in Attack or Special Attack that only applies to Fire attacks. In Generation V forward, the ability now works even if the user is frozen. However, if the user is never actually hit by the fire attack, they do not get the boost.

Pokémon with Ability

 * Vulpix
 * Ninetales
 * Growlithe
 * Arcanine
 * Ponyta
 * Rapidash
 * Flareon
 * Houndour
 * Houndoom
 * Heatran
 * Litwick
 * Lampent
 * Chandelure
 * Heatmor

As a Hidden Ability

 * Cyndaquil
 * Quilava
 * Typhlosion

Trivia

 * Flash Fire's effect is similar to Sap Sipper, Lightning Rod, Motor Drive and Storm Drain, though it is limited compared to these.