Knuckles the Echidna.
I would await Sonic's arrival on Angel Island (Sonic 3) and explain the situation to him and help him stop Eggman. Later, I would plan with Sonic and Tails how to prevent Eggman from breaking the Master Emerald and thus not awakening Chaos (Sonic Adventure). Some time later Eggman would look for his grandfather's documents and access to the ARK (SA2), so I would promise Rouge many jewels to prevent the master emerald from being damaged. All other SA2 events would occurr normally.
I would be in charge of warning Tails and Rouge about Metal Sonic to stop him before his final transformation (Sonic Heroes). I would then talk to Sonic to travel to the future with Chaos Control and steal the Phantom Ruby (which will save trouble there, but it doesn't matter now). I'll keep it to create an illusion and protect Angel Island.
Years would pass, and Silver would arrive warning about the future (after attacking Sonic and all that). Thanks to the Phantom Ruby, we could mislead and defeat Mephiles. We could somehow create an ideal container to seal it once more, and save ourselves a lot of time travel, and losing memories (since losing them would ruin everything I did).
Eggman would surely try to awaken Dark Gaia, so I would prevent Sonic from doing so, and the two transformed would attack Eggman to avoid it, also avoiding the Werehog transformation. We would force him to surrender and be arrested, with no escape.
I would go back to my island with the ruby and Colors, Generations and Lost World would never happen. Eggman would be in prison, and the ruby of that time would appear, having two at the same time. I would use both of them to destroy each other, and that would end this story.
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