To perform the chaos spear move, Shadow must be in his super form- accessible in the last boss battle against Devil Doom. Hold down the attack button (the one that you would use to fire a weapon) and wait until a blue light surround Super Shadow. Then, release the button. He will fire a lightning bolt of blue energy toward the target and he may say 'Chaos spear!'.
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While playing as Shadow after purchasing all three memory shards enter into the third form of chaos boost. Holding the button again in midair will send shadow into a charge state and letting go of the button will make him release the chaos blast. Unfortunately it is far weaker than it was in Shadow the Hedgehog. It isn't really worth ever doing because it is so weak and has such a short range.
Shadow is the ultimate life form, he can use chaos control; chaos blast with on chaos emerald and chaos spear and chaos warp with two, he his as fast as sonic and can fly with his shoes and had the world in his grasp once and his own game and his very strong, smart and awesome. Tails has two tails is yellow and flies instead of running and is a sidekick and his game was bad.
Sonic is perfectly capable of using chaos control. However, in sonic adventure 2 (the technique's introduction) it is shown that he is far less skilled than shadow is and thus it takes more energy for him to use it. Because of this it is assumed that while sonic is capable of unleashing the chaos emeralds powers to the fullest extent more than anyone else (super form is stronger) he doesn't have as much skill as Shadow manipulating the emeralds power. Essentially, Sonic can use chaos control but not as well as Shadow can and is thus far incapable of the other chaos abilities (chaos spear, blast).
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.
Yes, Gerald Robotnik did not know when he created shadow the hegehog about sonic so after he finished you could see for yourself shadow can do everything sonic can do: He's fast, He can use chaos control and he has a super form so clearly there the same.