To beat the final eggman boss in xx zone...follow the following instructions:

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Platforms will keep rising up and down; they will shoot out
steam before they do, however. His only weak point is his head; you don't need
to be on a platform to hit him there. The ceiling is lined with spikes, so do
not jump up too far. He also will occasionally shoot out his arms; he will
constantly aim them at you, so be ready to avoid them by jumping quickly. He
will also shoot a giant laser out of his eyes, so if you're jumping at him when
he does this, you'll be in a world of hurt. You can destroy his arms with
enough hits; doing this makes the battle a lot easier.
MISC: Standing slightly between the back two raising pillars (more to the back,
keeps you out of attack range, (and if using cream, puts you in JUST close
enough range to attack all parts)). But that spot works for all characters, and
Knux can even hit the fists at that spot too. Tails' slash also works.

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that's the way to beat him!!