You can find rare candies in mountains and you can use th dowsing machine.Rare candies can level up Pokemon,but beware,the Pokemon wont be as strong as the level is. It will get a bit stronger but not as strong as you think...:(
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Rare Candies are scattered all over the Sinnoh Region, so try your luck.I'll give you a start - One Rare Candy is in the Old Chateau
deleting all youre Pokemon but not youre starter then fly home
There are only a set amount you can get from the environment without 'randoms' (Pokemon picking them up). For locations, Google it. To have more than the set amount: Have all Pokemon in your party have the ability to pick random stuff up. You can get Rare Candies that way.
the rare candies are at the bilding befor national park inside go th the door on the left at the pokelethion when you enter you play games and earn points you need 2000 points for a rare candy
You can't buy rare candy in fire red. You can find them all over the region though.