The Mighty (1998) on Netflix

This is the heart-warming story of a unique friendship shared by two seventh grade boys, Kevin and Max. Kevin, afflicted with a rare physical disability that prevents him from living a normal childhood, is an extremely intelligent boy who lives in the world of his imagination. Max on the other hand, is an over-weight boy who suffers from a learning disability and has failed the seventh grade several times. Fate brings the boys together when Kevin is assigned to tutor Max in his reading skills; here their magical journey begins. These two boys, who appear on the surface to have nothing in common, find they share many painful realities of being outcasts, and of being abandoned by their fathers early in life. Kevin's enchanting world of knights and their quest for justice is brought into reality through his exciting journey with Max. Through their adventures, they find a friendship providing completeness of self and an unbreakable bond of love.