From Bulbapedia, the community-driven Pokémon encyclopedia.
DuArt Media Services (formerly DuArt Film and Video) is an American dubbing company and voice recording studio that picked up the Pokémon anime.
They originally dubbed the short film Pikachu's Island Adventure in 2007. Then, starting with The Rise of Darkrai, they began handling the series full time. Their first episode was Tears for Fears!.
The games PokéPark Wii: Pikachu's Adventure and PokéPark 2: Wonders Beyond have also been dubbed by them.
Starting with Pokémon the Series: XYZ, DuArt Media Services has been the dub producer in Mexico, working in cooperation with Jarpa Studio. They also worked with MG Studios in Brazil until Pokémon the Series: Sun and Moon - Ultra Legends.
Pokémon the Series: Sun & Moon was the last series dubbed at the studio, the last episode being Thank You, Alola! The Journey Continues!, with their successor being Iyuno Media Group and Goldcrest Post.