From Bulbapedia, the community-driven Pokémon encyclopedia.
Yoko (Japanese: ヨウコ Yōko) is Gardenia's assistant and a character of the day who appeared in The Grass Menagerie!.
She greeted Ash and his friends as they arrived at the Eterna Gym. Yoko later refereed the Gym battle between Gardenia and Ash.
- She strongly resembles Kumiko Yamaguchi from Gokusen. Incidentally, both of them have the same Japanese voice actress.
- She is also the only character of the day whose Pokémon has appeared in an earlier episode.