No weapons: Both Shadow and Sonic have equal speeds, but unlike Sonic, Shadow can use Chaos Control without the Chaos Emeralds. Shadow would likely win.
Weapons: Sonic and Shadow use the Chaos Emeralds to go super. Tie.
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probably i don't knowwhen it comes to a fight thay would be Evan when it comes to raceing sonic could win just about but when it comes to the most powerfull outof shadow and sonic then probably shadow but if thay wher using alllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllll that thay coud do then just about sonic gooooooooooo!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! sonic the hedgehog!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
No weapons: Both Shadow and Sonic have equal speeds, but unlike Sonic, Shadow can use Chaos Control without the Chaos Emeralds. Sonic would likely win. Weapons: Sonic and Shadow use the Chaos Emeralds to go super. Tie
Shadow can win if he have Chaos emeralds, in a fair fight, tails would whack him with ease by timing Shadow's speed attacks like in the comics.
Seeing as how Shadow and Sonic are of equal ability, Shadow would be able to beat Metal Sonic. This is because Metal Sonic cannot beat regular Sonic.
Sonic is stronger than Shadow and Silver because Sonic can knock Shadow out so bad that when he would cry in his death because Shadow cant even get close to Sonic and if he does then Sonic can use sonic wind to blow him away and then it's lights out Shadow!