Go to Dr. Friendship's house in Stormy City, which is the third of fourth gym, I believe. He's in the town, so just visit the houses until you find him.
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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.
Nowhere. The soothe bell was introduced in ruby/sapphire
The soothe bell is found in the Pokemon Mansion on route 212. The soothe bell is given to the player by the maid on the second floor.