Guts

Guts raises the ability-bearer's Attack by 50% when inflicted by a major status ailment (poison, burn, paralysis, freeze or sleep). If burnt, the Pokémon does not suffer the usual drop in Attack.

All other effects of the status condition remain, e.g. losing HP each turn (poison, burn), speed drop (paralysis) or being unable to attack (paralysis, freeze, sleep).

Game descriptions

Ruby
Sapphire
FireRed
LeafGreen
Emerald
Ups ATTACK if suffering.
Diamond
Pearl
Platinum
HeartGold
SoulSilver
Boosts Attack if there is a status problem.
Black
White
Black 2
White 2
Boosts Attack if there is a status problem.
X
Y
O.Ruby
A.Sapphire
Boosts the Attack stat if the Pokémon has a status condition.
Sun
Moon
Ultra Sun
Ultra Moon
It’s so gutsy that having a status condition boosts the Pokémon’s Attack stat.
Sword
Shield
B.Diamond
S.Pearl
It’s so gutsy that having a status condition boosts the Pokémon’s Attack stat.

Other languages

EnglishGuts
SpanishAgallas
ItalianDentistretti
Japaneseこんじょう (Konjō)
GermanAdrenalin
FrenchCran