Moxie
16 Pokémon can have Moxie: 5 as a regular Ability and 11 as a Hidden Ability.
What does Moxie do?
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.
Which Pokémon have Moxie? (5)
Which Pokémon have Moxie as a Hidden Ability? (11)
How Abilities work · Hidden Abilities explained · Every Ability