There is none.
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beat all missions with gold
I guess you have to buy a yellow/gold chaos emerald at the shop
To acquire Chaos Emerald Gear, you must attain the highest rank on each Story Mode mission.
You have to do all the missions with the highest possible rank on each mission and then it will tell you that sonic has a new gear called chaos emerald
you have to get ALL missions in mission mode gold i only got one gold
you have to get extreme rank in all hero and Babylon missions. it's HARD, but it's worth it!
Yes you do, you piece together Emerald shards and create a Chaos Emerald.
To get the Chaos Emerald board, you need to complete all missions with a Gold Rank.
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).