try Sonic the Hedgehog super pack at toysrus (the three super hedgehogs and all seven chaos emralds)
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Chaos is a Water-ish type of creature who came from the Master Emerald, also if you feed him a Chaos Emerald, he will turn more powerful: Chaos 0, Chaos 2, Chaos 4,Chaos 6 & Perfect Chaos.
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).
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
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.