At Saffron city.. In their house,, in her room; go upstairs after talking to her father and sister.. :)
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She's in Saffron City in Kanto.
In the fan club in Vermillion City.
safron city
You Find it in the Vermillion City Pokemon Club. and Then once you have it just go up to her and press A
First you have to go talk to the copycat girl in the upstairs room of her house in saffron. She will say that she lost it in Vermillion City. Go to Vermillion. In the Pokemon fan club a man will have it. Talk to him and he will tell you to give it back to the "poor" little girl. Go back to Saffron and give it to the copycat girl. She will then give you a magnet train ticket to Goldenrod City back in Johto.