The BulbaWiki network will be locked from editing starting at Sunday, February 9 at 7PM UTC in order for us to upgrade our MediaWiki version. The lock will likely last approximately 48 hours. During this time, you can follow our social media for updates, check the Bulbagarden home page for up-to-date Pokémon news, and discuss it on the forums or in the Bulbagarden Discord server.
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.