Pokemon: Season 1, Episode 7

1 - 7: The Water Flowers of Cerulean City

Ash and friends arrive in Cerulean City and Ash must battle Misty to recieve the Cascade badge. Later on, their battle is interupted by Team Rocket who attempts to snatch all the Pokémon in the Gym with a giant vacum! Then Pikachu uses his thunderbolt on Team Rocket and they are blasting off again.