In Pokemon Gold, the Copycat Girl will give the player the rail pass when they give her a doll. The doll can be obtained from a member of the Pokemon Fan Club in Vermillion City.
Chat with our AI personalities
Once you give the doll to the copycat girl.When you come out Steven will talk to you about Latias.Use your poke'gear to find her.She will be roaming Kanto.
safron city
First you need ticket from Saffron City by giving Copycat girl her Clefairy Doll in Fan Club in Vermillion City.
First get the machine part that was stolen from the power plant ( its in the cerulean city gym) then give the machine part to the guy near the generator in the power plant after that go to saffron city and find the copycat's house ( near the magnet train) and she will ask you to get her poke doll, go to vermillion city and go inside the Pokemon fan club in there a fat guy has a clefairy its a doll talk to the guy and you will get the doll. Finally give the doll to the copycat and she will give you the rail pass!:)
Answering from memory, there is a girl known as the copycat girl who lost her clefairy doll. and you have to go get it and give it to her. I think its found in a Pokemon fan club or something. sorry if my information is not 100% correct.