Chao evolve to different styles and types of chao. Your chao will not be the same as it is after it evolves, unless you make him a neutral unbiased chao. Chao have 2 evolutions. The first evolution is basically instantaneous. They will form a cocoon around themselves and will come out a few moments later as a completely new chao. The second evolution is a gradual process and takes time for it to fully occur. The first evolution is achieved by 1 of 2 methods.
By feeding onto your chao, they can evolve to their second stage. They will evolve when their stamina reaches around lvl 10-12 or around the time they turn a year old.
Chao will naturally transform into their second form if left alone. Many times, this will result in a neutral unbiased chao, which many dislike due to their plain appearance.
When a Chao evolvesEdit
A Chao will evolve about 3 hours after birth, sometimes longer. A Chao's life is roughly 15-17 hours long, and once they reach the end of their lifespan, they will either die (form a gray cocoon) or reincarnate (form a pink cocoon). Whether they die or reincarnate depends on how well you treated them!
The second evolution can take some time. Each of the aforementioned chao can evolve into one of 5 MORE chao, depending on their skills. The most interesting thing about the second evolution is that, after the chao has changed, you can re-change the chao! For example, you would make a Dark/Swim/Swim chao, then you would stop giving the chao swimming animals and drives, and give it power animals and drives. This makes the chao convert into a Dark/Swim/Power chao! There is a method; by exploiting this, you can get a chao that is half-way between two evolutions . You make a 2nd evolution chao, then you switch to a different set of animals an drives until it is how you want it to look. Without doing this method, there is a total 75 different chao you can have. For more info on chaos and every single possibility of every chao there is go HERE. The second evolution changes quickest at 2 and ends after age 3.
Extreme Evolution or Third Evolution can happen in-game. But mostly people use it with a chao editor because they don't believe it exists. But it does. When you give your chao many Run and Swim items and then giving them Fly and Power items. Thus making it a R/S/F/P chao. Make sure you do this when your chao is in the 2nd stage or it will not work. Now, When it starts to grow. Your chao will have odd shapes, For example. If your chao is blue, It will have blue squares around it. If you keep evolving it like this, It will become a glitch chao. And the extreme value will be activated. This can be changed with fusion's chao editor. Currently theres no other way than that or memory hacking. There is no thing as the fourth evolution, If that existed. Your chao will be glitched all around it and he will become invisible, and his eyes and his wings will disappear.
A chao's death can occur in 2 ways. They can have a gray cocoon and die forever. OR, if they were happy in their life, they will have a pink cocoon and be reincarnated as a baby chao again. They will have a fraction of their previous skill points.
Chaos Chao are chao that will never die or grow old. There are three types: Angel (Hero), Light (Neutral), and Devil (Dark). If you follow these steps carefully you will be able to make the chaos chao of your choice. It is recommended that you read this whole section before you begin the process.
The first thing you need to do is have your chao reincarnate two times or more. Reincarnation is when your chao turns from an adult to a child. To find out, go to the chao doctor, the amount of reincarnations is under "Transformations". It is useful the fact that you can have as many as you want, because it means that you can get an all S chao (if you don't know what this is, then do some research in chao abilities!) Remember, you can't reincarnate the chao ever again, and so won't be able to raise the chao's ability ratings!
Once It becomes a child for the third time (remember it starts as a child) the process can begin. Once you have your chao in the right garden, the next step is to give your chao one of every animal. There are 21 animals total, and since you can only carry ten with you, its best to take note of which animals you've given your chao, and which you haven't. After your chao has received all 21 animals, the next step is to convert your Chao to the alingment you want it to have.
Most people say that you may not give ANY chaos drives to your chao. However, they are wrong. This has been tested and proved that giving your chao chaos drives will not affect your chao in anyway, shape or form. Please note that you must give them in a balanced order, to keep them a Normal Type.
Once you have completed all of these steps you basically have to play the waiting game. That is you've done everything you need, now you have to wait until your chao gets old enough to evolve for the last time. Once your chao cocoons, you will hear a very distinctive jingle, and you will have your chaos chao. Chaos Chao can still participate in all chao activities except for mating. Since they are immortal, they have no need for reproduction and do not breed.