Here is the cloning glitch. (thanks to "POKETAZ" for the duplication glitch find and "The Edge" for a simpler translation)(update by SecretSquirrel)
CLONING GLITCH/MULTI CLONING GLITCH/ITEM CLONING GLITCH. (thanks to The Edge for complete instructions)
1.) Go to the PC in the battle tower. Must be on Emerald Version only.
2.) Deposit the pokemon(s) you want to clone in any slot of Lanete's PC. Or, if you want to clone items, give the item(s) you want to clone to any pokemon in the PC.
3.) Exit the computer and save your game.
4.) Withdraw the pokemon(s) or item(s) from the PC that you stored in step two.
5.) Talk to the lady behind the counter closest to the PC.
6.) She will ask if you want to make a challenge. Select yes and choose any two eligible pokemon from your party.
7.) She will tell you that you must save the game before making a challenge and ask you if that is OK. Select yes.
8.) The game will freeze for 2-3 seconds.
9.) After, but not during, the freeze, turn off the game. It is not necessary to save again.
10.) When your game is turned back on, the cloned pokemon(s) or item(s) will be both in your party and in the PC.
!WARNING! : If you deposit a pokemon between saving and talking to the link battle receptionist, it will disappear forever. The first time you try it, use a pokemon you don't care about, so you can make sure you have it right. You don't want to lose one of your precious high-leveled/legendary/one-of pokemon! Do not clone 6 Pokemon at a time" and "Don't turn off during the freeze" Both cause you to lose Pokemon and/or MS's have been confirmed in our group!"
Please don't discuss trades or if you think cloning is good or bad here please. thanks!
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FOOTAGE OF GLITCH
(movie made by GetThunderStruck) (you don't have to use an empty box or the first slot of box though)
OK here is the new thread.
EDIT BY Dratini927: Everything cloning related should be discussed in here.