I don't know of any for sapphire, but you can send Pokemon from sapphire to emerald clone in emerald and send it back to sapphire. Here's the cheat.
Go to the battle frontier, then the battle tower, then go to the ninth box in the PC, and empty it of all Pokemon. Then, put the Pokemon you want to close into that box, holding an item you want cloned. Then, save the game, and turn the console off. Turn it back on and withdraw the Pokemon. Then, talk to the woman closest to the right. Choose an open battle and choose Pokemon other than the one you put into the PC. When she's saving your process, turn the concole off, then turn it back on and there the Pokemon will be in your party and box 9.
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you can't you have to trade him through ruby
Currently, there is no code for cloning a Pokemon with a cheat device. However, there is a way to do it without one, and were you not a cheater I would tell you. It involves the GTS.
You can not unless you use third party modifiers like an Action Replay.you can get it if you have a pokewalker and translate a pokemon into it and when its saving you turn the game off and there you have two pokemon
By Useing Gameshark or other cheat codes.
you could just get a trade for ditto.