Rare Candies!
Johto region: Route 34, Violet City, Ecruteak City (With Dowsing MCHN), Olivine City (With Dowsing MCHN), Radio Tower (Earn 25 Points at Buena's Password), Mt. Mortar (With Dowsing MCHN), Mt. Mortar, Tin Tower, Whirl Islands (With Dowsing MCHN), Whirl Islands (With Dowsing MCHN), Mt. Silver (With Dowsing MCHN), Shining Lighthouse
Kanto region: Route 27, Route 28 (With Dowsing MCHN), Vermillion City (Fan Club President), Cinnabar Island (With Dowsing MCHN), Indigo Plateau (With Dowsing MCHN), Cerulean Cave (With Dowsing MCHN), Victory Road
You can also purchase some Rare Candies in the dome next to the National Parl (where Bug catching contest is held).
If you have a Pokemon with the ability "pick up" there is a low probability of picking up a rare candy, but not likely.
NOTE: You really don't need the Dowsing MCHN, it just makes it easier to find the rare candy since they are "hidden" in certain locations.
More tricks, tips and cheats for this game are right here - Pokemon Silver cheats
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