By feeding it fruits. Hi im Jose yes feed them kill Robots ingame and give what they drop to your chao or Chaos in that matter give them Hero/Dark fruits and i recomend to Go to City escape its the easiest place to get Rings also when you are going up some staris and theres 3 enemies 2 in your sides another one flying kill the 2 robots in your sides go to the top right side you will find the Chao Box *Find all 3 of them and in the third they give you a special and rare animal that levels up your chao easily* next one is after the second time you rail there is gonna be like a little Hill or something thers the second box and last but not least a little bit after that when you rund down a builing and you use like a pole to jumo into the air or something there is the last box *THE Rare animal