You beat all eight gym leaders then talk to prof. Elm in heartgold.
No you can't
you cant get it without action replay take a look on eBay for action replay I got my action replay for cristmas.
Clone them using action replay
Using master ball
All you have to do is use the master ball
u get it off a man in the bilding
You can't'.
You use an action replay.
You would need to use an Action Replay code by using Action Replay DS or a flashcart which supports Action Replay codes.
To get more than one Master Ball, you must trade Pokemon that are holding them to your game.
i dont realy no the last guy was right but it might not work
Just use the program "A-Mart"