How do you delete a chao in sonic adventures 2

Oh that's easy! Just pick up the chao you don't want and walk over to the Game boy Advanced thing that you will find in each chao garden.
Then step onto the red spot while still holding your chao, your chao will then be tossed inside it then you will see some options go to Good-bye.
It will then ask you if you want to say good-bye to this chao say yes then it will ask you if you are sure say yes again then your chao will be gone forever

thank you :)