After obtaining the other 7 badges you return to Viridian City and the gym will be open.
Viridian city.
Beat the eighth Gym, which is in Viridian City!
In the viridian city. The gym leader is the boss of team roket
he is in the gym in vermillion city on fire red and/or leaf green
Fight the seventh gym on Cinnabar Island. Then fight the eighth gym at Virirdian City.
after u beat the gym leader on cynabar Island the gym, that wuz closed the whole time will be open
Viridian City.
As the gym leader, Giovanni is supposed to be the eighth of them. So you have to beat the other seven before you can get to him.
The eighth badge can be obtained by defeating the gym leader in viridian city.
After the eighth gym? Or after Pokemon league? well, for eighth gym, i recommend.. I got nothing, but for after Pokemon leagu, they give little exp, so Red.
The eighth gym leader is in Viridian City. Remember the gym that always seemed to be closed? Now that you've gotten the other seven badges, you'll be able to enter the gym and face its gym leader - Giovanni, who you already faced at the Rocket hideout in Celadon City and Silph Co. in Saffron City. He uses Ground-type Pokemon.
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