Rare Candies are only obtainable through:
* Catching certain Pokémon: Some Pokémon, like Chansey and Mr. Mime, have a chance of holding a Rare Candy when caught.
* Trading with other players: Players who have obtained Rare Candies can trade them to you.
* Defeating certain trainers: Some trainers in the game may have Rare Candies as rewards for defeating them.
So, while you can't buy them directly, you can acquire them through these other methods. Good luck finding those Rare Candies!