From Bulbapedia, the community-driven Pokémon encyclopedia.
Grin (Japanese: グリン) is the alias used by Fukiko Nakamura, a musical artist who has done work for the Pokémon anime. Her first Pokémon work was By Your Side ~Hikari's Theme~ as an ending for Pokémon the Series: Diamond and Pearl. She also made an appearance on the 10th movie soundtrack, performing Is It Summer? along with Asakusa Jinta.