This trick requires two memory cards (with another Sonic Adventure 2 Battle file on the second card), a link cable, and a Game Boy Advance. Put the Chao to be duplicated onto the Chao Transporter. Drop off your Chao to the Game Boy Advance. Then, go to "Move" on the Chao Transporter and transfer your real Chao (not the one in the Game Boy Advance) to a Sonic Adventure 2 Battle file on the second memory card. Next, pick up your Chao copy from the Game Boy Advance and transfer it to the Gamecube. You can now move back your real Chao from the other memory card to the first file you were working with.

This trick requires two memory cards. To get two free normal Chaos at one time, put two memory cards in the slots. Transfer all your Chao into one memory card (through the GBA Station). Erase Chao data on the first memory card, transfer the Chaos back, and then you will find two Chao eggs. Note: If you have acquired the Dark and Hero gardens, they will be lost. You have to earn them back again with babies. Also, If all your Chao do not fit on the memory card, either get another memory card, or you will lose them.

Use the following trick to copying a Chao with two memory cards and no Game Boy Advance. Put two memory cards into the Gamecube. Next, copy your Sonic Adventure Battle 2 file from the first memory card over to the second memory card. This will delete your Sonic Adventure Battle 2 file on the second memory card if you had one. Next, go to the Chao Garden (it does not matter which one, on which card) and go to the transporter (the big Game Boy Advance), select "Move Chao", and transfer whichever Chao you want from the second memory card to the first. If you do not want the file on the second, delete it. You can do this as many times as needed.

This trick requires two memory cards and a Game Boy Advance with link cable. Take a Chao to the Chao transporter. Drop off the Chao in the Game Boy Advance. Then, go back in and pick it up. Immediately after you select "pick up", disconnect the link cable. If done correctly, you will have the Chao both in the Game Boy Advance and the Chao Garden. Move the Chao in the garden to the other memory card. Then, move the one in the Game Boy Advance to the first memory card. Note: If you do not move the one in the first memory card to the second memory card and try to pick up the Chao on the Game Boy Advance, it will erase the Chao in the garden, leaving only one Chao.