Monotone Colour Change Chao
There is a certain rare type of Chao that has it's whole body of one colour (with [so far] one exception) just like the store bought Chao; such as the Green Chao, Blue Chao and so on. However, it's colour, unlike those just mentioned, can change. Some people have dubbed it the "rainbow Chao", or the "chameleon Chao", I have just recently thought of a good name for it; read below:
"Monotone Colour Change Chao" (MTCC Chao)
Mono~single
Tone~colour
Note: Monotone Chao are the single coloured Chao purchasable from the Black Market.
Colour change~ Monotone Chao can't change colour, but this one can, so I've specified that it can.
I have been told a recipe to get one, here it is:
"Shiny Pink + Normal = Shiny Half-Normal + Normal = Monotone CC"
Thanks to MintyDreams7 for that. I have not personally tested that method, but I'm sure it doesn't need shiny pink, I got my first one in a similar way to that, but with shiny white. So from that equation I got from MintyDreams7 I can conclude...
Shiny Monotone Chao + Normal Chao= Chao X.
Chao X + Normal Chao = Monotone Colour Change Chao.
Note: I have had a few complaints about the above method not working, I am currently raising up new Chao to breed like above, to test it myself, and if need be, to tweak the recipe.
Note 2: I am raising up new Chao bought from the Black Market so the results aren't contaminated by other genes in the parent's history. If you had troubles getting an MTCC Chao, I recommend you do the same.
If you want a simple description, it changes colour depending on a Chao's main colour you can see.
If you want a more detailed explanation, keep reading.
It has a constant colour about it, the whole body is of a single colour, however, the colour changes. Some, inexperienced, people say it changes at random, or has no particular path of colour change, they are horribly wrong. Its body colour changes like that of a normal Chao's colours.
Every Chao has what I like to call a base colour, that colour is the one that usually varies the most between a normal Chao, and a half normal Chao, and that colour affects the rest of the colours; the Chao in question has its whole body the colour of its base colour, just like a normal Chao. But normal Chao have other shades of the base colour, although this one, does not.
Recent observations have shown that the Chao's whole body is not necessarily the same colour. Every body part's colour is calculated independantly to the other. This means that the arms, legs, body, tail and head may be different colours. I have only seen this on neutral/swim Chao, most of them have tails and feet of odd colours.
The colours follow a general rule of thumb; I'll briefly describe them:
Hero (all):
Main body colour; which is always white. Nothing more, nothing less. A real bummer for Hero Chao fans.
Dark:
Dark + Swim + All: Colour of the belly, lower face, and extremities.
Dark + Fly + All: Colour of the hands, and the tips of the feet and jesters.
Dark + Run + All: Colour of the stripes and other markings of that colour.
Dark + Power + All: Colour somewhere between the belly and feet to the orange on the hands.
Dark + Normal + All: Colour of the tips of the hands, feet, head, and tail.
Neutral:
Neutral + Swim + All: Colour of the belly, and lower half of the head and arms. The feet and tail are usually a much different colour than the majority of the body.
Neutral + Fly + All: Same colour as the majority of the body.
Neutral + Run + All: Same colour as the majority of the body.
Neutral + Power + All: You know those zig-zag rings on the Chao? Well that's the colour!
Neutral + Normal + All: Basically the same colour as the majority of the body.

Dark/Fly/Fly - MTCC Reala Chao.

Dark/Fly/NA Shiny MTCC Basic Reala Chao.
Note: "NA" means that the Chao has not begun it's second evolution. I may use that quite a lot