Red (game)
Red is the main playable character in the Generation I games and their Generation III remakes. He is a curious 11-year-old boy from Pallet Town in the beginning of his adventure. The Yellow version instruction booklet explains that Red became interested in Pokémon after his best friend, Blue, stopped playing with him and became a bully. At the end of the game, Red becomes the Pokémon Champion after defeating the Elite Four and his rival, Blue.
By the Generation II games, he has arguably become a Pokémon Master. It is assumed, however, that Lance defeated Red in the Pokémon League, because now Lance is the Champion. Red trains constantly on Mt. Silver and doesn't say anything to any Trainers he may come across.
Pokémon
Red is technically the most highly-skilled Trainer in the Generation II series. His team is probably an advanced version from Pokémon Yellow.
