The key is hidden in the basement of Pokemon Mansion which is located on Cinnibar Island.
there is a key in the Pokemon mansion... you need it to get into the gym... search the Pokemon mansion thoroughly
Its inside a pokeball inside the Pokemon mansion on Cinnabar Island
It unlock the door to the gym in Viridian City. .
You will need to work your way to the basement in the Pokemon Mansion, you will then find the Key.
First beat the fifth gym leader and get the HMsurf from the safari zone, then go to pallet town and surf downwards until you reach cinnibar island. there you can challenge blaine the 7th gymleader but only after getting the secret key which is inside Pokemon mansion.
to open the door of the 7th gym!
You will find the key to the Gym of Cinnabar Island, From the Pokemon Mansion that is on the same island.
there is a key in the Pokemon mansion... you need it to get into the gym... search the Pokemon mansion thoroughly
you have to go into the pokemon mansion on cinnabar island and navigate your way around there untill you find the key
Its inside a pokeball inside the Pokemon mansion on Cinnabar Island
in the mansion.
First surf down from pallet town then go into Pokemon mansion and get the secret key then go into the 7th gym and beat blaine.
The key to the gym
The key is in the Pokemon mansion.
It unlock the door to the gym in Viridian City. .
The Secret Key that you get in the Pokemon Mansion is used to enter the Cinnabar Gym.
Use the HM surf and go south from pallet town you will eventually reach cinnibar island the gym is locked though to open it find the key in Pokemon mansion.