1.get some animals in your chao garden.
2.make sure your chao is standing still.
3.pick up any animal
4.come close to your chao but don't give it to him just stay close
5.drop animal to chao
6.If done correctly the animal you gave your chao should should stand still and should still sparkle
7.quickly pick up AFTER you hear that ping sound and give AFTER your chao stops dancing
You may do this as many times you want i did it to my chao that just hatched and in an hour or 2 I got everything up to 99, it's worth the effort! ;)
p.s does not work with food... sorry.