You can only spin dash on the non next gen versions when the countdown is at 1 you either shake the Wii Remote but I dunno what you do for the PS2.
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If you press o you do sonic boost, do that on a speed dasher and sonic will spin dash.
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.
Spin Dash???? You can only do it on Wii when the ountdown gets to 1 at the start shake the Wii Mote
Hold B
in the death battle of mario vs sonic sonic won by a spin dash to the back.