You can't. There are only a few rare candies in the game, unless you keep trading.
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you have to cheat! you could also try to clone by using the daycare
yes there is you olnly need a meoth with it's pick up abilitie and it will give you rare candies and some other usefull items
You cannot get these pokemon without trading. But you can cheat by using gameshark codes.
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It depends if you have a way you can cheat or not