Use the itemfinder where Mr. Fuji was in the Pokemon Tower.
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You find a soothe bell at the Pokemon mansion
thare is no soothe bell in gold.
You trade any Pokemon for Jasmine's Steelix, and it will be holding a Soothe Bell.
Go inside the Pokemon tower in lavendar town and go to the top floor stand in the spot where mr fuji used to be then use the itemfinder you should dig up a soothe bell item.
Nowhere. The soothe bell was introduced in ruby/sapphire