Generation Iii
Guts
Ups ATTACK if suffering.
Detailed Effect
Whenever this Pokémon is asleep, burned, paralyzed, or poisoned, it has 1.5× its Attack. This Pokémon is not affected by the usual Attack cut from a burn. This bonus does not count as a stat modifier.
Pokémon With Guts
26 canonical Pokémon forms can have this Ability.

Rattata
Raticate
Machop 
Machoke
Machamp
Heracross
Ursaring
Tyrogue
Larvitar 
Taillow
Swellow
Makuhita
Hariyama
Timburr
Gurdurr
Conkeldurr
Throh
Obstagoon
Ursaluna
Machamp Gmax
Flareon
Shinx 
Luxio
Luxray
Squawkabilly Green Plumage
Squawkabilly Blue Plumage