From Bulbapedia, the community-driven Pokémon encyclopedia.
Karen Neill is a voice actress who works on the properties of 4Kids Entertainment. She was a voice actress for the English-language dub of the Pokémon anime.
Neill joined the series at the start of the Advanced Generation series and left at the end of the eighth season, when Pokémon USA took over the dubbing and distribution of the series. She has not returned to provide voices for the anime since.
Voices on Pokémon