Justifiedin Pokémon Polished Crystal

Justified is an ability that raises the user's Attack stat by one stage each time it is hit by a Dark-type move. This would turn an opponent's Dark-type attack into an opportunity for the user to become stronger in physical offense - however it is only found on Growlithe and Arcanine which are not weak to Dark-type moves. Basically, just avoid dark moves on Growlithe and Arcanine unless you already know their ability!