i did it after 3 trys so my advise is dont destroy his crystle attack and keep using tails and thunder shoot

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I can't help you with the final showdown with eggman (It's been so long i forgot how i did
it), But i do know that its NOT the end of the game, Get all chaos emerealds from bonus
levels to unlock the REAL final battle between super sonic and metal sonic, Then metal
madness (Robot dragon), Then get all emeralds and complete all levels with rank A (as
result collect 141 emblems) with all teams, To unlock the fith team, Metal sonics side of
the story (He's the mysterious robot hidden in the dark storm on the opening cutscene, And
the real final battle (If you havnt found this out for yourself already)...