Moxie

 is a Pokémon ability introduced in the fifth generation. It raises attack defeating an enemy.

Description
After directly knocking out another Pokémon with a damaging move, the Pokémon  with Moxie increases its Attack with one stage. If the Pokémon fainting ends the battle, Moxie does not activate. Moxie resolves its effect after the Attack gain from Fell Stinger. If a Pokémon with Moxie defeats a Pokémon  with Mummy, Mummy activates before Moxie can activate.

Pokémon with Ability

 * Sandile
 * Krokorok
 * Krookodile
 * Scraggy
 * Scrafty

As a Hidden Ability

 * Pinsir
 * Gyarados
 * Heracross
 * Mightyena
 * Salamence
 * Honchkrow
 * Litleo
 * Pyroar

Trivia

 * Beast Boost is a similar ability except it increases the Pokémon's highest stat.