Like the article said before, he has been best friends with Spyro for their times can tell. They were both hatched together, raised together, and had their adventures together.
After birth to the beginning of their adventures
Not much is exactly known about his life after his birth.
The First Adventure
The realms were being attacked by Gnorcs. Spyro and Sparx are chosen to save the realms and defeat the Gnorcs for good. Sparx is sometimes captured and Spyro saves him. Together, they saved the realms and were known then.
The Second Adventure