The 8th Gym in Pokémon FireRed and LeafGreen is actually in one of the first towns you go to. The gym is located in Viridian City.
Giovanni
TM 26 (Earthquake) is a reward for beating the 8th Gym Leader in Viridian City
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Where to get the 8th Gym BadgeYou have to go to the gym in Viridian City. It will now be unlocked. The 8th gym leader is Giovanni of Team Rocket. He has some high lvled pokemon. Be carfeul with his powerful Pokemon. I recommend that you use a water type Pokemon since he mostly uses ground type pokemon.
Beat the 8th Gym, led by Giovanni in Viridian City and he will give you tm26: Earthquake.
Giovanni is the leader of team rocket and the 8th gym leader in fire red and leaf green.
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.