Shadow the Hedgehog (Sonic Adventure 2)

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

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

The second battle takes place on an infinite straight track on the Space Colony ARK, after Sonic clears Final Rush. Unlike before, Sonic must keep running to stay ahead of the falling platforms below. Like the previous battle, Shadow 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, then he will use Chaos Control to warp in front of Sonic. If he gets too far ahead of Sonic, he will use his super move, the Chaos Spear. Five hits are nessesary to defeat Shadow.

Trivia

 * The second battle against Shadow is remade in Sonic Generations, in one of the three rival battles.