Unlockable How to Unlock
Soothe Bell Use Itemfinder where Mr. Fuji was in the Pokemon Tower.
Leftovers Itemfinder where Snorlax was near Cycling Road and Silence Bridge.
Macho Brace Use Itemfinder where Giovanni was in Viridian Gym.
Sacred Ash Use Itemfinder where Ho-Oh was in Navel Rock.

hope this helps and please give me good ratings