Go to Saffron City and talk to the girl upstairs in the pinkish house. Then go to Vermillion City and then go to the fan club and talk to the fat guy. Then he will give you the lost item. When you have it, go back to Saffron City and give the girl the doll, and she will give you the magnet train pass.
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Goldenrod City
Get on the magnet train and it will take you to Goldenrod city. You can back and forth between johto and kanto easily using the magnet train, but it's not essential.
In the Pokemon Gold and Pokemon Silver video games, the Magnet Train must be fixed after the player completes the main quest in Cerulean City. The player must defeat the Team Rocket members there and take back the stolen part from the Magnet Train, which is in the Cerulean Gym. Returning the stolen part to the Power Plant will fix the Magnet Train.
if you are in kanto it is in saffron city but if you are in jhoto its in goldenrod city
first you go see copycat in saffron city and then you go to see the man in the Pokemon fane club and then you go back to copycat and then you get the magnet train pass.