This is the best cheat ever!!!
If any of you want more of your best pokemon follow these instructions.
#1: after beating the elite four fly to the battle frontier
#2: go to the battle tower
#3: put the pokemon you want cloned in the pc then save and take it out
#4: talk to the link multi battle room lady then pick challenge pick the either open level or level 50
#5: pick the pokemon that are eligible for it then she'll ask you to save say yes then there will be a pause and it will ask you to save again say no
#6: turn off your game turn it back on and *poof* there will be the pokemon you cloned in your party and one in your PC.