if you mean the clefairy doll go talk to the girl who wants it in saffron city (she is in the colourful house) then go to the Pokemon fan club and the guy next to the statue will give it back to you the lastly go back to saffron and give it back
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the doll is in vermillion city in the Pokemon fan club
In the fan club in Vermillion City.
You Find it in the Vermillion City Pokemon Club. and Then once you have it just go up to her and press A
There is no best Pokemon on Pokemon HeartGold.
there is no Pokemon Mansion in Heartgold.