In order to perform a homing attack in Sonic Generations, you are supposed to have gained all 5 red stars before you can unlock a homing attack. However; there is no much use of the homing attack as the destruction caused is minimal.
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classic sonic cant do a homing attack but modern sonic can. I think you press the A button then press A again. classic sonic does do a spin dash. to do a spin dash hold the left stick down then press A.
sonic generations,or both!
The way to hurt Silver is by Homing attacking him when you get close. This can be by either home attacking any objects he has levitated to reach him, or by simply getting close enough that the homing reticule appears on him. On his final hit, he will create a giant meteor of garbage and throw it behind you.
Kill the Giant Monsters until you can use Chaos Boost. Use it, Mephilles will appear. Use homing attack on him. Repeat until dead. Multiple chain homing attacks may have to be used if he summons clones in a chain.
Sonic Generations.