How to Get a Sonic Chao

Hatch any color Chao from an egg of your choice. Try to use a regular Chao, not a color one or else the Chao will look like Sonic but not in the right color.

Keep the Chao neutral by raising it with any hero and dark character together. Have both of them spend equal time with the Chao.

Get either green chaos drives, or animals that give your Chao speed: bunnies, cheetahs, skeleton dogs, etc.

Have your hero and dark character take turns giving the Chao the drives/animals. It's recommended to use animals because they give your Chao more points. Also, stamina does not matter! Even though many recommend raising your Chao's stamina level to 15-16 it doesn't have to. It can evolve at any level. However, raising the stamina level to 15 makes it evolve right away, but force feeding it takes a long time unless the Chao's personality is "Big Eater". Otherwise, continue to care for it with both Sonic and Shadow/ any hero or dark character.

Make sure that your Chao's run stat is the highest (raised last because it will not evolve to be the right type).

• If you used animals, remove the animal parts from your Chao by using skeleton dogs (which can be found at Pumpkin Hill on Church Mountain).
  

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Be patient. After the animal parts have been removed, your Chao will eventually evolve into a neutral run type Chao. It should have a green ball over its head, green wings, three quills on its head, and its body will be green (unless you used a monotone colored Chao from the Black Market). This is a basic Sonic Chao. To see if your Chao is a run type, take it to the Chao doctor and see its medical chart.

Wait. To make an advanced Sonic Chao that looks a lot more like Sonic, the Chao has to be three Chao years old. A Chao year is about three to four hours in real life spent in the Chao garden.