not in ruby or sapphire
you should have a duplacate but you can sell it illegaly
You cannot duplicate Master Balls in any Pokemon game.
just catch a dugtrio in a cave about 4 times and go to Oak. He'll ask u a question just answer yes.
Well, I could be wrong, but I think it is impossible. Me and my sister tried and failed. We tried to trade two Bidoofs, a boy and a girl, so we could tell...but it didn't work. I think it silently saves after you make the trade, so there's really no turning back- just trading back. However, you CAN duplicate goods underground. First, get the good you want to duplicate. Then, go back to the surface and underground again. Make sure the friend who you want to give the duplicate to is there. Then talk to them and say you want to give them something. Give the good that you want to duplicate. Then turn the power off once you say good-bye. You will still have the good, and so will your friend! But if you just want two of the same good, you'll have to have the friend trade it back.
first u need to beat the elite four to get acces to battle tower. then you chose three non legendary Pokemon e.g. swampert blaziken and skeptile steps 1. get the Pokemon 2.go to a PC and put those Pokemon in an empty box 3. then exit PC and save 4. get your Pokemon out of the PC 5 now go to double battle thing in battle tower 6 now the hard bit what you do is you talk to the lady until she asks do want to save game click yes and then just before it finish's saving turn the game boy or Nintendo off and check your Pokemon you will have the three Pokemon now check your PC and you should have three Pokemon p.s sorry if it was boring or doesent work first try just have alot of goes
You could try nail polish remover but that might scrub the paint off your littlest pet shop just dab a little but if some of the paint gets wiped off then all i can say is buy a new duplicate of your pet :/...