Get all 8 Kanto badges and then go to the girl in Saffron city called 'Copycat' (she is in one of the houses on the second floor). She will be missing her lost Pokedoll. Go to the fan club in vermillion city and speak to the man next to the clefairy Pokedoll. He will ask you to take it to her. Give the doll to Copycat and she will reward you with a Magnet Train pass.
If you still need to get electricity to it though, go to the Power Plant and find the missing piece if the Generator (Its in Misty's gym in Cerulean City, behind the inflatable tubes in the top left of the gym) one of the team rocket grunts will pop out and run away from you , go back to the powerplant and talk to the guy who is trying to work the generator , then go back to cerulean and go out of this town through the top golden bridge , the team rocket grunt should be there and he tells you where he has hidden the piece, afterwards , take it back to the powerplant and the train will be working again . This will return power to it and allow you to ride it once you have the pass and the 8 gym badges.
Hope this helped.
you know the copycat she needs her doll and go to vermilion then go to the fan club hous then talk to the guy and he gives you her clefairy doll then you go back then she gives you the magnet train pass
after you get the magnet train pass use the magnet train
go to magnet train manger and ask him to give you a train pass
you can ride the magnet train
You can use it to take the magnet train to kanto I think.
you go to the Pokemon tower
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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.
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.
bang your mom
saffron city
You talk to the copycat girl in the city with the magnet train in Johto and bring her her pokedoll from viridian in Kanto
The magnet train stations are located in Goldenrod and Saffron city.