Justified

Being hit by a Dark-type move boosts the Attack stat of the Pokémon, for justice.

Level-Up

The following Pokémon can equip this ability after reaching a certain level.
# Pokémon Type Level
287 Minitaur
54
288 Maxhitaur
54
95 Growlithe 36
96 Arcanine 36
87 Gallade
90
406 Archigloom
1
324 Riolu 18
325 Lucario
18
307 Absol 72

Natural Ability

The following Pokémon can have this ability when you find them in the wild.
# Pokémon Type
406 Archigloom

Hidden Ability

The following Pokémon can have this ability as their hidden ability.
# Pokémon Type
95 Growlithe
96 Arcanine
87 Gallade
325 Lucario
307 Absol

Tutored Ability

The following Pokémon can be taught this ability.
# Pokémon Type
59 Staravia
60 Staraptor
12 Eageleag
13 Griffogrif
6 Demichu
250 Rangife
251 Taranalloy
252 Alcesteel
246 Delibird
330 Phenyxy
331 Resurrenix
287 Minitaur
288 Maxhitaur
416 Mienfoo
417 Mienshao
95 Growlithe
96 Arcanine
87 Gallade
144 Mudsdale
406 Archigloom
187 Braviary
245 Heracross
184 Corvisquire
185 Corviknight
324 Riolu
325 Lucario
307 Absol
344 Qwilfish
345 Overqwil
261 Grandelion
415 Cosmyriad
341 Pinsir
375 Axeldown