Edge is a childhood friend of Saxon's. They went to school together up until high school. They still continued to be good friends, at one point even best, before Edge's parents sent him way to a private school- St. Mortiel, which surprisingly is the rivaling school of Armonia, the Institute in which Saxon attends.
Edge, although younger than Saxon, has a bit more intellect than his friend due to his parents desire for their son to succeed highly in education- but has less experience when it comes to battles. He and Saxon still get along with one another, and hang out often even with the school differences. Being younger, Edge has always looked up to the Luxray.