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Casey's Beedrill
From Bulbapedia, the community-driven Pokémon encyclopedia.
Ash caught Beedrill in the Bug-Catching Contest in The Bug Stops Here. In capturing it, he won the contest, and, according to the rules, the winner can keep the Pokémon he or she caught. However, Ash gave it to Casey afterwards because of her love for yellow and black-striped Pokémon. It has since become one of her three main Pokémon, along with Meganium and Elekid.
Due to appearing only very shortly before being caught, Beedrill's original nature remains uncertain, although it was shown possessing agressive characterics typical to its species while attacking Ash. After joining Casey's team, it seems to have adapted Casey's confident and cheerful attitude, eagerly joining Casey, Meganium, and Elekid in performing the Electabuzz theme song.
A † shows that the move was used recently, unless all moves fit this case or there are fewer than five known moves.
In the manga
Ash's Beedrill in The Electric Tale of Pikachu
In The Electric Tale of Pikachu manga
Ash captures a Beedrill in The Electric Tale of Pikachu manga, although it is never seen being used. He thought this Beedrill would help him to raise his Trainer level, but it couldn't.