Mimey
Mimey (Japanese: バリちゃん Bari-chan) is a Mr. Mime who lives with Delia Ketchum. He does housework for her, apparently in exchange for room and board. Its Japanese voice actor is Yuji Ueda and its English voice actress is Kayzie Rogers.
How he came to live with her is told in the episode It's Mr. Mime Time, in which Ash dressed as a Mr. Mime to inspire a real Mr. Mime who worked for a circus. Delia knew about this, so when a wild Mr. Mime came to her door and wanted lunch, she thought it was Ash in costume, and provided it with food. When the real Ash showed up, still in costume, she was quite puzzled, but wound up keeping Mimey as her live-in maid.
It is unknown if Delia has actully captured Mimey, as she is never shown with it's pokeball.
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Related articles
For more information on this Pokémon's species, see Mr. Mime.