Fly to Saffron City and find Copycat's house, ( it should stand out ) and go up the stairs to talk to her. She'll mimic you saying that she lost her beloved Poke Doll somewhere in Vermilion City. Go to the Pokemon Fan Club House and talk to the fat guy on the couch. He'll say something about doing something with a Poke Doll he found, then realizes that it belonged to the girl. Return it to copycat and she'll give you the pass
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Chat with our AI personalities
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
train it
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
after you get the magnet train pass use the magnet train