Go to the gym in Vermillion City in Kanto and battle Lt. Surge, the Gym Leader. He'll give you the 9th Gym Badge after you defeat him.
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It is not possible to get a ninth badge in Pokemon FireRed. You can only get eight badges in Pokemon FireRed.
GET THE LAST BADGE......
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You beat the 6th gym leader.
Once she starts to cry, talk to her again and she will give you the badge.