Pokemon Season 1 Episode 21 - Bye Bye Butterfree

⁣As the group continues on their way, they notice a flock of Butterfree
out over the ocean. Brock informs Ash that it is the mating season for
all of the Butterfree. Ash decides to release his Butterfree so that it
can mate. However, Team Rocket has plans to steal all the Butterfree.