Welcome to PokéCommunity! Register now and join one of the best fan communities on the 'net to talk Pokémon and more! We are not affiliated with The Pokémon Company or Nintendo.
I don't know exactly how, but go to youtube and type in "pokemon cloning glitch."
There should be a video that shows how to clone pokemon in emerald.
After you clone them, you can get them to D/P via Pal Park.