You need to get 50 rings in a stage on each world and it will ask if you want to do a special stage. If you complete special stage , you will get chaos emerald
Chat with our AI personalities
It is found in the final boss of Sonic Colours.
You can get the fourth chaos emerald in Sonic XX by changing the background to the Egg Carrier. Then change Sonic into the Eggman costume and click on his chest area.
The fifth chaos emerald is above your first one not right above it.
Yes, using Chaos Control (but he needs a Chaos Emerald with him).
Tikal, who appears in Sonic Adventure and Sonic Adventure 2, is a priestess for the Master Emerald and Chaos, the god of chaos. She seems to be related to Knuckles.