The eighth badge in Viridian City. The gym leader is Giovanni. In order to enter the gym you have to have all seven badges, and have beaten Giovanni at Silph Co. and Rocket Game Corner.
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Head back to Viridian City and challenge the gym there (it will be open now) to get your 8th badge. After that come the Pokemon league.
You can obtain the 8th gym badge (the earth badge) in fire red from Giovanni in Viridian City.
Get the Thunder Badge And Talk To Jenny And She Will Give You One
Strength will activate when you get the RainbowBadge.
in Viridian city. the one that was locked.