You will find it on the table at the Pokemon Fan Club. Talk to the person at the table and tell him about Copycat lesing her Clefairy Doll. He wil give it to you. after you return it to Copycat in Saffron City, she will give you a pass for the Magnet Train.
in the vermilion fan club
Talk with the guy in the fanclub in Vermilion. He has the doll and will give it to you.
in vermelion city. the house above the gym leaders
You have to take it with you.
in golden rod city and in saffron city but you need to find the copycats doll to get a ticket for it
Go to the Pokémon Fan Club and talk to the fat man. He will give you Copycat's doll.
vermilion city at the poke fan house
fix the power plant problem,then go to the pokefan house in vermillion city,and talk to the guy and you obtain the doll.
In Vermilion City, Pokemon Fan Club (the house with the green roof just above the Vermilion gym). Talk to the guy next to the table, who has a clefairy doll.
pokefans hoes in vermilion city
at lt. surges city is go to the Pokemon fan club and talk to the fat guy in the middle of the room
In Gold, Silver, Crystal, HG and SS, you first go to Copycat and then she tells you that she loses it in Vermilion City. So fly to Vermilion City and go to the Pokemon Club and talk to the guy that is sitting on the Coach. He then gives you the Poké doll that he "found".