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Yoko (Japanese: ヨウコ Yōko) is Gardenia's assistant and a character of the day who appeared in The Grass Menagerie!. She refereed the match between Gardenia and Ash.
| Not much is known about Nuzleaf. It was first seen bringing a note summoning Gardenia back to the Gym. It was later seen during Ash and Gardenia's Gym battle, copying Yoko's hand signals.
None of Nuzleaf's moves are known.
|| The Grass-Type Is Always Greener!
- 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.