Professor Ivy
From Bulbapedia, the community-driven Pokémon encyclopedia.
Professor Felina Ivy (Japanese: ウチキド博士 Dr. Uchikido) is a Pokémon Professor who resides on Valencia Island. She is considered very attractive, but her beautiful looks do not negate her achievments as a Pokémon Researcher.
She and Prof. Oak are good friends. Prof. Ivy found the GS Ball and contacted Prof. Oak about it, but even her finest equipment couldn't crack it open.
Brock falls in love with her and stays with her during Ash Ketchum's Orange League adventure.