there is no key you buthead!
Why are you playing yellow? Heart Gold and Soul Silver were just released.
You need to go through the Pokemon mansion and beat all the trainers. At the last one you get the "secret key" to Blaine's gym.
the cinnabar key is in a poke ball that is in the Pokemon mansionin the last floor of cinnibar gym.
The key to the gym
there is a key in the Pokemon mansion... you need it to get into the gym... search the Pokemon mansion thoroughly
You use the key to get in o the fire gym to get into the last gym.viridian city which is above pallet town which is where you began.Viridian City.The leader is Giovanni, who uses Ground-types.
You will find the key to the Gym of Cinnabar Island, From the Pokemon Mansion that is on the same island.
where is the exact location of the key to open the petalberg's gym in pokemon perla not on pearl?
Get the key from the basement of the mansion next to the gym.
in the bottom of the Pokemon mansion
Find the secret key in the Pokemon Mansion,( Next to the gym)
First swim to the island in the far south west of the map and get the key from the burning mansion then u have to go to viridian and battle the gym leader there also. this last gym will be the team rocket leader as the gym leader.