West of Celadon city and the north entrance of the bike only path. Go inside, and walk upstairs. Professor Oak's aide will give you the Amulet coin, only after you have caught at least 40 different Pokémon.
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Either its the big building to the left of celadon city or the one left of fuchsia city but at the top of the building an Oak Aide will give you an amulet coin if you registered 40 Pokemon in your pokedex.
In the big building either it's west of celadon city or fuchsia city but there is a prof oak aide inside on the top floor and he gives you the amulet coin if you have registered 40 Pokemon in the pokedex.
In Red the Amulet Coin item does not exist.
You can find an Amulet Coin in the Goldenrod Department Store basement.
you get 30 different kinds of pokemon and go west from celadon city.a guy(oaks aide) upstairs in the route entrance gives you it.