With that said, he could have been created by an offscreen villain, or by a good person by accident, or maybe even an established character like Red or the Sorceress. Even if he wasn't created by anyone, he might have been spawned by a random magical hiccup that he eventually learned to replicate to create his army.
At the very least, it might explain why he seems to literally hack up the gems when he's defeated.
On the very last page of the original manual, is a picture of a large purple dragon, wearing a gold medal, and seemingly giving a lecture to an unseen audience. It doesn't seem unreasonable to think that might be an image of future Spyro, recounting his adventures to the next generation.