In Pokemon FireRed you have to get through Silph Co to continue. To get through it, you need to be able to beat 31 trainers.
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You can find it in Silph Co. on 5F.
Use the portals or the elevator.
The Silph Co. building is located in Saffron City. Walk into the entrance to get in.
You have to beat team rocket in Silph Co
in saffron city but make sure that the team rocket grunt is sleeping