This was awesome!
Great animation there, man. Unfortunately, this is the first Flash you have made that I really liked.
I absolutely LOVE the Sonic franchise, and you really did well with this.
There are people complaining about the lack of sound here, but that fact really helps to add to the seriousness of the rivalry between Sonic and Metal.
The music fits perfectly, and the only thing that could make this better is Super Sonic. I know it's tired and old, but I just love the raw power Sonic gets like that.
I guess sound effects would make it better in some aspects, but having no sound has it's advantages too. (Except music. Music is a must.)
Anyway... you get a 5 from me, and a Gold-Ring Medal from your fans.
P.s. I think I speak for everyone when I say "Shadow vs Silver Sonic II"