Players of pokemon diamond & pearl, i need help!!!?

how do you clone your pokemon?? is it even poissble, and if it isn't how do people get more then one eeve?? i really need 2 khow cuz my cousin is getting diamond like me and he wants me 2 get him the pokmon that u can't get in diamond from my friend who has pearl, but my friend dosen't let me keep his pokemon.(we trade right back) my cousin and my friend will never meet, so i need away 2 clone my friends pokemon so i can give one back and keep one.So please help me, o and do u have 2 have a ditto 2 clone,