I don't know about Diamond/Pearl... But for Emerald: go to Battle Frontier. Go to Battle Tower. Put a Pokemon in the PC. Save. Then take it back out. Go to Free Battle. Enter the Pokemon you want to clone and another Pokemon. It will ask you to save. Say no, then reset. You have that Pokemon in your party and in the PC. Pokemaster95
Action Replay
You can't without cheating with like an action replay or a gameshark.
With Action Replay Of Course
Pokemon can be copied on Pokemon Platinum. But to do it you need an action replay. = =
you can only copy Pokemon if you have action replay or i think gameshark. but you can copy pookemon only for a double battle if you have a ditto.
You would need to use an Action Replay code by using Action Replay DS or a flashcart which supports Action Replay codes.
i dont think there is one
the code is 9392859032548585839tt398t84=9863f48370586846262431410e032490353250593406890596059796478065785687058ty5038654386056 copy and paste it
I DONT KNOW. I am trying to do that for my action replay but it just says errors.I will tell you when i figure it out.
I believe it is impossible unless you get an action replay, and copy a code that makes it happen. Action replay is a cheating device ($19.99).
you might be able to if u have a Action replay with the code u can find out in the internet
Copy and paste the code below into the action replay. 375026650600000000 574654839486605586 768589596969506000 0000000000000000000 0000000000000000000 0000