Casey's Meganium
Casey's Meganium (Japanese: ナナコのメガニウム Nanako's Meganium) is Casey's first and primary Pokémon. She obtained it as a Chikorita the day before Ash, Brock, and Misty arrived at Professor Elm's lab. Its voice actress in both Japanese and English is Mika Kanai.
Casey first appeared with her Chikorita in The Double Trouble Header. It had just helped her to capture a Rattata when she met Ash and his friends. She and Ash got into an argument about the Electabuzz baseball team, and she challenged Ash to a battle. Ash defeated all three of her Pokémon using his Charizard.
Casey and her Chikorita were next seen in The Bug Stops Here. She and Ash were competing in a Bug-Catching Contest when they were attacked by Team Rocket. Casey used her Chikorita, and during the battle, it evolved into Bayleef and sent Team Rocket blasting off.
When Ash and friends met up with Casey again in Here's Lookin' at You, Elekid!, her Bayleef was now fully evolved into a Meganium. Using her starter, Casey was able to capture an Elekid.
Casey and her Meganium have also appeared in A Date with Delcatty and Those Darn Electabuzz!
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For more information on this Pokémon's species, see Chikorita, Bayleef and Meganium.