Instructions
Obtain the Basement Key from Petrel on the fifth floor of the Goldenrod Radio Tower. Petrel is a high-ranking Team Rocket goon who uses five Koffings and a Weezing on his team. Petrel gives you the Basement Key upon defeat.
Enter the Goldenrod Underground and walk down the long hallway on the right side of the tunnel. Use the Basement Key on the door to enter Team Rocket's basement warehouse lair.
Defeat your Rival upon entering the basement. The Rival's Pokemon team consists of a Golbat, Haunter, Magnemite, Sneasel and the Pokemon he picked at the beginning of the adventure.
Step on the colored stitches in the correct order to unlock all of the basement's doors. The switches must be activated in the following order to open all of the doors: red, blue, green and purple.
Walk through the next room and battle the Team Rocket grunts to save the Executive of the Radio Tower. He rewards you with a Key Card that opens the top stories of the Radio Tower. Exit through the elevator in the back of the room and leave through the Department Store.
Return to the Radio Tower and foil the high-ranking Team Rocket members' plans on the upper floors. Use the Key Card on locked doors to navigate the Radio Tower. Beating all of the Team Rocket grunts will banish their presence from Goldenrod City.