Battle Bond

Transforms this Pokémon into Ash-Greninja after fainting an opponent. Water Shuriken's power is 20 and always hits three times. This ability cannot be copied or replaced. This ability only takes effect for Greninja.

“Defeating an opposing Pokémon strengthens the Pokémon’s bond with its Trainer, and it becomes Ash-Greninja. Water Shuriken gets more powerful.”