How do you clone a Pokemon in Pokemon Emerald?

Answer 1

Go to battle tower first then do what ever listed below

1. Put that Pokemon in a box, doesn't matter which one;

2. Save;

3. Withdraw the Pokemon from the box;

4. Talk to the lady on the far right and agree to do the challenge;

5. Say Yes to the need to save the game;

Now, you have to wait a second before it gives the saving prompt.

6. Do NOT Save, instead, reset (soft and hard both work) the game;

7. When you turn on the game, you'll have the Pokemon in your team and in the box

and im sad to say it works only for emerald.