Impudence

“Quand le Pokémon met un ennemi K.O.,\nsa confiance en lui ne connaît plus de limite\net son Attaque augmente.”

This Pokémon's Attack rises one stage upon knocking out another Pokémon, even a friendly Pokémon. This ability does not take effect when the Pokémon indirectly causes another Pokémon to faint, e.g. through poison or Spikes. If this Pokémon knocks out a Pokémon with Mummy, the former's ability will change without taking effect.