You Find it in the Vermillion City Pokemon Club. and Then once you have it just go up to her and press A
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In the fan club in Vermillion City.
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.
you get from th copycat girl in Saffron city. you need to go to vermillion after talking to her to get the pokedoll from the guy in the Pokemon fanclub building (not the old man). give the doll back to copycat girl and she will give it to you
Go to the copycat's house (the pink house in saffron city), go upstairs. Talk to her, she should whine about losing her clefairy doll or something. Go to vermillion city, go to the Pokemon fan club. There should be some fat guy sat at the table with a clefairy doll. Talk to him, get the doll. Go back to saffron city, give copycat the doll & she gives you the train pass.Talk to the Copycat Girl in the pink building. She should tell you that hear CLEFAIRY doll is missing. Go down to Vermillion City and go into the Pokemon Fanclub. Talk to the man near the entrance and he will give you the CLEFAIRY doll. Go back to Saffron and the Copycat Girl will trade a Magnet Train Pass to you for it.If she doesn't, I believe that you might have to advance to some point. Not quite sure, though.You have to return Copycat's stolen Pokedoll to her. Copycat is in the same city as the magnet train (in the Kanto region). She is in a little pink house. The pokedoll is in Vermillion city, in the Pokemon fan club building :DHope I helped!!
(first, you must fix the power plant near cerulean.) You must give the copycat girl in saffron city her lost doll. Talk to her, and she will mimic you, saying that you will go find the doll for her. Go to vermillion city, and enter the Pokemon fan club. Talk to the guy at the table with the clefairy doll. He will give you the doll. Return it to the copycat girl, and she will give the magnet train pass.