After you talk to the copy cat, go to the Pokemon fan club in vermilion city. There's a guy who stands near the Clefairy doll on the table. Talk to him and he will give you the doll. Then go to the copycat's house and talk to her...then tah-dah, you get a pass!
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You go to Vermillion City and go into the Pokemon Fan Club, near the Pokemon Shop
The Lost doll is in vermilion city in the Pokemon fan club building. it's on the table and looks like a Clefairy.
Aftnr u found the machine part for the powerplant speak to the copycats parents then speak to the copycat
(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.
To get the Magnet Train Pass, you must go to CopyCats house, it is on the street below the Magnet Train, and is a pink house. On discovering she has lost her clefairy doll, you must fly to vermillion city where the Pokemon Fan Club is. Talk to the guy standing next to the clefairy doll on the table. He will give you back the doll, you return it to Copcat, and voila! You have a magnet train pass.