Nope, you can only find them.
By the way, they sell for 5000, which suggests that if it were possible to buy them, that it would be 10,000 apiece.
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Buy an action replay and set it to 999 rare candies
You cannot buy rare candies, it wuld be amazing if you could, but the only for unlimited is through cheating for example a GameShark
You cannot purchase rare candy anywhere in the game.
If you want tonnes of rare candies, I suggest you save up your money to buy gameshark or action replay ds/gameboy advance to hack the game and get extra rare candies.
Buy a Action replay and stuff