Sonic (Sonic Adventure 2)

"All right, Shadow! Time for me to finish this!"

- Sonic, before the second fight

Sonic the Hedgehog is fought in two boss battles in the Dark Story of Sonic Adventure 2. Both fights are done by Shadow the Hedgehog.

Battle
The first battle takes place in a square field on Prison Island, after Shadow clears White Jungle. Sonic attacks simply by jumping and performing the Homing Attack. Shadow has to hit him from behind when he is not jumping to hurt him. Three hits are required to defeat him.

The second battle takes place on an infinite linear track on the Space Colony ARK, after Shadow clears Final Chase. Here, Sonic is the final boss of the Dark story. Unlike before, Shadow must keep running to stay ahead of the falling platforms behind him, or else the player will lose a life. There are also meteors that will hurt Shadow when they explode. Like the previous battle, Sonic will mainly attack with the Homing Attack. His other actions depend on his position during the fight. If he falls behind or off the track, he will use Chaos Control to warp in front of Shadow. If he gets too far ahead of Shadow, he will use his super move, the Sonic Wind. Five hits are necessary to defeat Sonic.

Trivia

 * The fight against Sonic in the Dark story is identical to the fight against Shadow in the Hero story. However, Sonic's warp time is significantly shorter, but the use of Sonic Wind causes Shadow to suddenly skid to a halt when running.
 * If ten minutes has gone by in the second battle, then the road ahead will collapse with further sections falling down just as they appear. While Sonic is safe thanks to his Chaos Control, the player will eventually die after hitting the death line.
 * If noticed during the first battle, Big the Cat can be seen below a vent.

Videos
Battle #1= Battle #2=