well first u can give a rare candy to a Pokemon then clone it and a rare candy comes with the clone keep doing that till u got as much candy as u want =)
you can give them a lot of rare candies
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You can't.
no. but there is one for 999 rare candies
Yes. With an action replay.
you have to get action replay and then you can get 999 masterballs rare candies and more even shiny pokemon
No there are not, sorry, but the only way to get rare candies are through finding them and do requests for admins.
You use action replay to get a code for 999 rare candies. It will let you have the ultimate Pokemon team
An Action Replay Code Manager has default cheats for Pokemon Diamond and Pearl, one, in which, includes a code for x999 Rare Candies. You can continually do this until you're satisfied, but I don't believe there are any "in game" codes to get infinite Rare Candies.
You find Rare Candy's in Poke Balls through your adventure.
you can find them all over sinnoh
no. Unless you have action replay.