Max is the younger sibling of May. He lives in Petalburg City with his family. He traveled with Ash, Brock and his sister May throughout Houen and Kanto. He returned home after his sister went to Johto and Ash and Brock went to Sinnoh.
Max knows a lot about Pokémon even though he is quite young. He tries to learn as much about Pokémon as he can so that when he turns 10, he will be prepared to start his own journey to become a great Pokémon Trainer.
Since Misty was no longer traveling with Brock and Ash, Max took up the role of dragging Brock away from the girls by the ear.