
Quick answer — Shouko Nakagawa voices Keldeo in Pokémon the Movie: Kyurem VS. The Sword of Justice, Suzuna Taki in Eyeshield 21, Karen in Pokémon the Movie: Secrets of the Jungle and 10 more characters.
Shouko Nakagawa voices Keldeo (Pokémon the Movie: Kyurem VS. The Sword of Justice), Suzuna Taki (Eyeshield 21), Karen (Pokémon the Movie: Secrets of the Jungle), Luna Mi Mad Magra (Level E), Maki (Pokémon: The Rise of Darkrai), Riku (Pokémon the Movie: The Power of Us), Infi (Pokémon: Giratina and the Sky Warrior), Oracle Fish (Dragon Ball Z: Resurrection 'F') and 5 more.
Keldeo is voiced in Japanese by Shouko Nakagawa.