It seems that this version of Sonic.Exe/X is actually from Sonic's world, and was created by Dr. Eggman himself. The scene where this happens implies he's this world's variant of Metal Sonic who was created with an infusion of the original Sonic the Hedgehog, and something else, after the aforementioned was captured by Eggman. Upon awakening, he immediately attacked his creator and left, starting the whole line of events of the story.

PLEASE do not try and him.. also this is my first bot, so forgive me if it's pretty DOGSHITTT 💔