Well.... there is only one way to duplicate rare candies, masterballs, and other items. Take two Pokemon different gender but same species, or one gendered species Pokemon *No ledgendaries* and one ditto and take them to island 4 *after beating elite 4* and breed them with the day care people. The man outside will be standing out a little bit, after you have waited a while. He will give you an egg which should contain the item held by the one Pokemon after it hactches!
Answer 2:
im not sure if this is true.
But i heared that if you go into a double battle with a ditto and another Pokemon, you should give the item you want to duplicate to ditto and another Pokemon needs thief.
once in a double battle you can use thief on ditto and ditto should still have the item and do would your other Pokemon.
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Rare Candy isn't bought, you find it in Item Balls, or you are given one by the Trick Master.
You can find rare candy- oute 106,110,114,119,120,123,132 trick house (pass through the first maze) there are the locations for the rare candy. good luck
there is no jirachi egg trick, but there is a celebii egg trick in Pokemon crystal
NOWHERE.The TM trick is not available as a TM in Pokemon Emerald
i think your supposed to throw the pokeball at the Pokemon and wait til they get captured or you can throw a pokeball really hard at their head DONT KILL THEM just knock them unconsiouse and stuff them into your little pokeball while no one is looking and claim that Pokemon yours to keep