From Bulbapedia, the community-driven Pokémon encyclopedia.
*LOL WORK IN PROGRESS*
Axxonn is a Pokémon Trainer. He lives in the outskirts of Canalave City, Sinnoh. Axxonn is a powerful trainer, though he does not show it when not battling. Although serious and focused when battling, he has a cheerful personality and jokes around at everything, much to the annoyance of his friends.
In the games
In FireRed and LeafGreen
Axxonn can be fought in Cinnabar Island.
In Diamond and Pearl
Axxonn can be encountered and fought in Canalave City.
In HeartGold and SoulSilver
Axxonn can be battled in Azalea Town.
In Black and White
Axxonn can be found in Mistralton City.
In the manga
Axxonn is an an aspiring young boy who dreams of being the ultimate Pokémon Master.