You give on of your Pokemon the soothe bell and it will get happy faster.(It helped me evolve my eevee and togepi.)
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YES you get one in the Pokemon mansion and you get another one somewhere else
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.
Well you could go to Cheryl in Eterna forest or go to one of the maids at the Pokemon mansion (sorry I don't know which maid) hope I helped.. but if those ways don't work trade a Pokemon holding the soothe bell and there you have it.