(also works in crystal version)
Have u wondered how to multiply pokemon or rare items??heres whatcha do:
give a pokemon(such as ho-oh, lugia,ect)an item (such as a rare candy,masterball,ect), and save the game next to a pokemon pc.deposit that pokemon. then switch the box.whenever you save, an icon says:"saving.... dont turn off the power".but before the sentence ends,(when it says "power",its to late)cut off the game(no, it does not hurt the game nor gameboy, or delete any items you may have).turn it back on,withdraw the pokemon in the box, and you should have 2 of the pokemon and of the item!cool huh?