In Pokemon Ruby, Sapphire, and Emerald, the player cannot battle the last gym until after the episode in the Cave of Origin. After Groudon/Kyogre have been defeated, the player can return to the gym in Sootopolis and fight the final gym leader.
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its actually the 8th gym so you need 7 badges and then it will unlock
Defeat every other gym. The Viridian City gym is actually your last gym, not your first.
The 7th gym leader in fire red is Blaine in Cinnabar Island.To unlock The gym, u must go 2 the pokemon mansion,search the gym key in the basement.
The gym in Viridian is actually the last gym. You'll unlock it after getting all the other badges. You should continue to Pewter through Viridian Forest.
You must get 4 badges before you can challenge the Petalburg City Gym.