To get a angel chao, let it die twice and if you get lucky, an egg will appear once it dies.
Use a hero character and make it white. Then give it all 21 animals.this is a animal chart.
Then give it a hero fruit.You can get that in a vmu chip which is a memory card. Put a chao in the chip and play through the vmu chip to find a hero fruit then give it to the chao to eat.
let it grow in a cocoon and you will get a angel chao
To get a Devil chao let it die twice and once again, if you treat the chao nicely,a egg will appear.
Raise it with a Dark character and make it black. Once again, give the chao all 21 animals.
Then give it a dark fruit which is in the vmu chip again. then let it grow in a cocoon and it will turn into a Devil chao.