Guts

 is a Pokémon ability introduced in the third generation. It increases attack if there is a status condition.

Description
When a Pokémon with Guts has a major status condition, its Attack is increased by 50% and it does not take the Attack decrease from burn. The ability does not activate if the Pokémon frees itself from being frozen, such as Flame Wheel.

Pokémon with Ability

 * Rattata (Normal)
 * Raticate (Normal)
 * Machop
 * Machoke
 * Machamp
 * Heracross
 * Ursaring
 * Tyrogue
 * Larvitar
 * Taillow
 * Swellow
 * Makuhita
 * Hariyama
 * Timburr
 * Gurdurr
 * Conkeldurr
 * Throh

As a Hidden Ability

 * Flareon
 * Shinx
 * Luxio
 * Luxray

Trivia

 * Marvel Scale and Quick Feet are variations on this ability for Defense and Speed respecitively