The Johto Region is not apart of the FireRed/LeafGreen games, thus GoldenRod City is not in the game. Plus, the Magnet Train isn't built to link Saffron City and Goldenrod City for 3 years later AFTER the time when FireRed/LeafGreen takes place.
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its very easy you just complete the gym and win tournament after that u go to kanto and someone will give u a train ticket and u can go with the train
First you need ticket from Saffron City by giving Copycat girl her Clefairy Doll in Fan Club in Vermillion City.
if you are in kanto it is in saffron city but if you are in jhoto its in goldenrod city
Goldenrod City
It is in Goldenrod city, but there is also one that is in Kanto.