Seven (whose last name is unknown) is a veteran Pokémon trainer who currently lives at Celadon City, known also as the Rocket Fortress. He was born on April 29th of 1989 in Snowpoint City, Sinnoh. He´s a trainer that dedicated his life to understand Pokémon from their perspective, learning about ther behavior and lifestyle. Accepting this living style he decided to train himself along his Pokémon letting him, after a few years, to use Normal and Fighting attacks that usually only Pokémon know.
As any other young trainer he started his journey after his 10th birthday. His parents opposed to his decision of becoming a Pokémon Trainer after he was severely wounded and poisoned by a bunch of Golbats while he was trying to save a Sneasel when he was 8, but still he disobeyed them and left Snowpoint City as soon as he received his first Pokéballs and his Pokédex.