If used in battle it will help you escape a wild pokemon, also if given to a certain person in saffron city you will be able to teach the move Mimic to any pokemon.
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The Poke doll distracts Pokémon
The poke radar doesn't exist in firered.
Go to the celadon dept store and buy a poke doll(on the 4th floor) then go to saffron city and go to the house left of the fighting dojo now in here give the little girl the poke doll and she will teach mimic to any of your Pokemon in your party.
futi gives it to you
If it's a special poke doll, it's in the vermilion city Pokemon fan club. A fat guy has it (meany).