They level your Pokemon instantly. 1 rare candy equals to 1 level up. But use them wisely.
Tip: Only use it when you cannot defeat an opponent or stuck on a part.
http://www.serebii.net/platinum/items.shtml and look up rare candy {by the way its rare candy not rare candy barb1 of the mall i think
get action replay
You can find a rare candy in wayward cave! I already found the rare candy there!
you cant
it raises your pokemon's level by one.
The Rare Candy in PC GameShark code is: 82025bd00044 d261dc6d197b4dc2 280ea26688a62e5c
you have to use an action replay and use the rare candy hack
I'm not sure i think you have to get professor oak to do it but i almost sure
You have to find poke balls in the wild which contain rare candy in them.
It elevates your Pokemon up one level.
On the Action Replay.
There is no stone but you can use a Rare Candy. That will make it go up 1 level, or you can get a Super Rare Candy. 1 in 100 games of Diamond, Pearl and Platinum have it replaced instead of the normal Rare Candy. Super Rare Candies make your Pokemon level 100 straight away, no matter what level they were on before hand.