You have to get an Action Replay or other device that works with your DS. Then you have to enter a code, but BE CAREFUL!!!!!Some codes can wreck your game!
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yes if u have a Pokemon pearl or diamond trade the Pokemon from the palpark then get another ds put pearl or diamond in then the platinum in the other ds and trade at the Pokemon center at the top
You can trade using two DS (ask a friend, family member) and put them in the two DS and connect.
you cant...
No.
To transfer a Pokemon to Pokemon soul silver or heart gold you have to transfer it to platinum, diamond, or pearl first. Then you are going to need another DS. Put platinum, diamond, or pearl inside one DS(depending on which one you put the Pokemon in), and SS or HG in the other. You can trade regularly between those generations of games. Hope this helped.