Copying Pokémon in PC *
9206B31E 00001808
0206B320 FB3EF7FB
94000130 FFF30000
0206B320 46C046C0
D2000000 00000000
* : for now this code is a bit 'dangerous', meaning if you don't follow the instructions the game may crash. Enter the PC, and -if it's not already in there- put in a box the Pokémon you wanna duplicate. Make sure you have at least one free slot. Now go in the 'Move Pokémon' menu, press A on the Pokemon you wanna move, so the list of choice appear, and then put the cursor on 'move' (it should be there by default), press 'Select+Start' while pressing A to take the Pokémon, and while the Pokémon is 'in your hand', press L and then R (to refresh the box) and voilà : your Pokémon will be duplicated (it'll be in the box, and in the hand) (fyi, not refreshing the box and dropping the Pokémon somewhere and trying to take the duplicated Pokémon WILL crash the game). Now that the box has been refreshed you can drop the Pokémon anywhere, and repeat the process as much you want.
(i copy and pasted this from wiki XD)
yep, it's an exact copy.
i wouldn't worry about it crashing your game though,
i've used it a lot and the only thing it did was turned my game on and off again a couple of times.