Get the key from the basement of the mansion next to the gym.
After obtaining the other 7 badges you return to Viridian City and the gym will be open.
You must beat the seven gym leaders, the elite four, and your rival. Then you have to capture 60 Pokemon to get your Rainbow pass the will allow you to travel to Island 7 in Pokemon FireRed.
no
go to cinnabar island then go into Pokemon mansion go through here to get the secret key which opens the 7th gym.
In his Gym in Cinnabar.
it is in saffron
beat the gym leader
the thunder gym in in vermillion city
In the cinnibar island gym.
You have to beat the 2nd gym.
there is no gym leader in lavender town
NO,but the map,the gym is the same as Pokemon firered.