Chaos Chao is similar to the beast (Chaos 0) from Sonic Adventure (DX). Except smaller.


Chaos Chao are special and unlike other chaos they're immortal.

THEY NEVER:

• evolve and die
  
• become sick
  
• mate (don't waste your Heart Fruit, it won't do anything, neither placing them on another chao that wants to mate)
  
• have their appearance changed by animals (it would be the same as giving them Chaos Drives)

NOTE: Treating them poorly won't get them killed (they'll hate you for it though)

There are two things to keep in mind: The Chao Cycle and Medical Chart.



These two are connected to one another.

Age: It tells you how many times was a chao reborn by pink cocoon. Their age can only go to 4-5. After that it resets.

Times transformed: When a chao is reborn by pink cocoon 4-5 times, the Age automatically resets to 0 and Times Transformed changes to 1 (or one higher).

NOTE: When chao's Age's at 4, at some point when it's an adult it'll automatically change into Age 5 before it's reborn. After that the Age resets to 0.

In Sonic DX, Health Center doesn't exist, therebefore you cannot know its status.
There is a program where you can see every chao's stats (while it's meant to cheat it is very useful to read).

Here's the link:
The link is in the description in "Fusion's Chao Editor 2.2 (SADX & SA2B)".

There's also a newer version Fusion's [SADX & SA2(B)] PC Chao Editor 2.2[chao.tehfusion.co.uk]

If you want more information about the program (2.2), look up here discussion and guide.
http://steamproxy.net/sharedfiles/filedetails/?id=334002249
NOTE: Be very careful while using the program. If you change anything in it, it may crash the game, including the program itself. So cheating isn't really recommended.

They also have three aligments. The process is same like any normal chao when you want them to be either Dark or Angel.

Also, another thing: if you want them to look as in the example below, you'll need a Neutral Chao.



If a chao is in any other color you've bought from Black Market, it'll also affect its skin.
(Ex. My chao hatched from white egg)

Okay, now that we're clear on that, let me tell you what it takes to get a Chaos Chao.

So far, you need to take care of a chao very well like any other. It's not limited to what animals or chaos drives you give it to, it won't affect the process.

Summarizing, it needs to be reborn 4-5 times. You can tell that by checking chao's Age on Medical Chart (Dr Chao).


(This one has already been Times Transformed once)

(In Sonic DX, you need a program to see its statuses. The link is above in "1. Before we begin")

Then the Age resets to 0 and Times Transformed turns 1.
Repeat the process and Times Transformed turns 2.



Times Transformed: 2

That's when you should be careful.

Just the very moment it hatches, you need to give it animals before it turns adult.

In either games, absolutely one of every animal should be given to the chao. (1 seal, 1 penguin, 1 gorilla, etc.) All of them.
In SA2 do NOT give the chao Chaos Drives! Not a single one. It'll collapse the entire process you've worked for (Okay, one or two won't really affect it, but I wouldn't bet on it).

Sonic Adventure 2


Sonic DX

BOOM! You got Chaos Chao! Congrats!

My very 1st Angel (Hero) Chaos Chao.

My 1st Dark (Devil) Chaos Chao.

My final Chaos chao, Netrual Chaos Chao.

They got all transformed in the same day on June 23th 2013.