BioBig is a Pokémon Trainer that was seen in a flashback scene battling Flint and his Monferno during the Pokémon League. "Big" is possibly the nickname given to him by Flint as he was using Snorlax, a big Pokémon to battle Flint. Also, Big is quite large in stature.
Big's Snorlax was seen during a flashback scene battling Flint's Monferno during the Pokémon League. It proved to be strong competitor and was able to pin Monferno with its Body Slam.