From Bulbapedia, the community-driven Pokémon encyclopedia.
Kotono Mitsuishi (Japanese 三石琴乃 Mitsuishi Kotono, born December 8th, 1967) is a Japanese voice actress for the Pokémon anime.
Mitsuishi first started her work early on in the series. Her first role was that of Duplica's Ditto, and she later provided the voice of all Azumarill that appeared in the show. Her most major human role was that of Domino in the special Mewtwo Returns.