She is a restaurant manager who lives near Saffron City with Mr. Mime as the chef, who cooked using Psychic and its other capabilities. Even though it looked good, the food tasted terrible, however. Because of this, her twin sister Rhoda thought of it and her as an amateur in cooking. The twins eventually divided their restaurant into two. After Brock taught it how to cook tasty food by not adding unnecessary spices, it became better in cooking.
Both sisters eventually had a competition to see who would run the restaurant. After helping Pikachu and their Pokémon escape Team Rocket's cage by using Trick and Psychic, her sister decided to have her run the restaurant. Rhonda decided to make her sister the co-manager as she was leaving and her Sneasel the head chef. Both of their Pokémon worked together to cook great food for Ash and his friends.
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Mr. Mime is Rhonda's only known Pokémon. It serves as the chef in her restaurant. While it was able to put on an amazing show with its psychic powers while cooking, and produced food that looked amazing, the food itself tasted horrible. Brock was able to help Mr. Mime out by teaching it how to cook without using its psychic powers. Eventually, Mr. Mime learned to make food that tasted as good as it looked. Later, once Team Rocket had kidnapped Mr. Mime as well as Rhoda's Sneasel and Ash's Pikachu, Mr. Mime cleverly used Trick to switch its ladle with the key to its cage and was able to free itself as well as Sneasel and Pikachu.
In both Japanese and English, Rhonda's name is a match to her sister's. In the English, there is only a one-letter difference in their names, while in Japanese, both Res and Toran are derived from restaurant.