Muchul's Trainer

This female Trainer is a character of the day who appeared in One Trick Phony!.

She battled Ash with her Smoochum, nicknamed Josephine. However, she stopped the battle after Josephine was knocked to the ground by Pikachu's Quick Attack. The Trainer let Josephine rest after the "intense battle", and recommended that Ash and his friends visit the Battle Park to practice against more Pokémon and Trainers.

(Source: Bulbapedia)