you make a porygon hold it and then when you trade it it evolves into porygon2
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Saffron City
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.
The Silph Co. building is located in Saffron City. Walk into the entrance to get in.
in the silph co. building.
You can find it in Silph Co. on 5F.