When sonic gets all the caos emeralds he can transform into (sonic gold). Basically all the caos emeralds sucks in to him and then he has power to destroy a hole ship. When sonic is gold he can also fly and there is always a golden dust round him. His skin turns yellow and no one can destroy him. If you go on page (sonic unleashed) on the bottom there is a film when he turns into gold and you get to see the caos emeralds.