you find rare candy in the random pokeballs
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The item duplication glitch (or Rare Candy glitch) can't be done in Pokemon FireRed version.
You cannot purchase rare candy anywhere in the game.
Rarely a pokemon that has the ability Pick Up it will find a Rare Candy item you will notice the item icon appear near your pokemon every now and then check it to see if it's rare candy. Apparently having the pokemon be a higher level gives you better items.
You can't buy rare candies in fire red. You can only find them, if you don't use cheats.
You can't buy rare candy in fire red. You can find them all over the region though.