You can't. You can get time stones though. To get one, you have to walk into the goal with 50 (or more) rings. Jump into the giant ring and defeat all the UFO's. You should now get a time stone.
When you get all 7 time stones, you get the special ending and you get the good future in every level.
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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.
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.