its behind the radio tower next to the name raters house but you need the basement key from the rocket executive
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The amulet coin is in the Goldenrod Department Store Basement (you get to it through Team Rocket's hideout in the underground path).
In case in goldenrod city take the underground path. There will be a door. Get the key from the rocket executive in radio tower. In case of lavender town we can't go underground.
Just go around to the other entrance next to the Name Raters House :P
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