Pokémon Season 1 Episode 6

Clefairy and The Moon Stone
Ash, Misty, Brock, and Pikachu arrive at Mt. Moon to find Team Rocket interfering with the local wildlife in hopes of finding the rare Moon Stone. With the help of Seymour the Scientist, the gang saves the Moon Stone and the Clefairies that guard it. Also, Brock catches a Zubat.