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
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You can use it to take the magnet train to kanto I think.
You talk to the copycat girl in the city with the magnet train in Johto and bring her her pokedoll from viridian in Kanto
after you get the magnet train pass use the magnet train
you can ride the magnet train
Talk to the copycat girl, she will ask you to go to vermillion city to get it back. Go see the man at the pokemon fan club with the clefairy doll then return it to the copycat end receive a magnet train pass