staging.bulbapedia.bulbagarden.net
Gary Oak
From Bulbapedia, the community-driven Pokémon encyclopedia.
Gary Oak is the prime rival of Ash and grandson of Professor Oak. In both the anime and the games, he starts out as a snot-nosed brat, but in the anime, he winds up maturing and becoming a Pokemon researcher like his grandfather. Blue's sprite matches almost exactly with the images of Gary, leading one to conclude that Ash is Red and Gary is, consequently, Blue.