Anime

Maxie appeared in two episodes of the Pokémon anime.

Maxie appeared in Gaining Groudon and The Scuffle of Legends. Maxie's goal was to expand the land of Hoenn believing that if so, the land would be peaceful. But at the end of the latter episode, Maxie realized the errors of his ways and finally changed his beliefs, now believing that the land of Hoenn is supposed to be kept as is.

Manga

Maxie does not have any fixed headquarters and moves his locations from cave to cave across Hoenn, ruling Team Magma like a barbarian gang, also making them more elusive. Because of this, Team Magma was able to steal the Scanner from the Abandoned Ship and both the Red and Blue Orbs. However, the latter was stolen by Amber's Volbeat for Archie.

After Rayquaza halted the fight between Groudon and Kyogre, Maxie and Archie went insane and attempted to destroy everyone who had interfered in their plan: the Elite Four, the Gym Leaders, the Regis, even their own members. It was Maxie's Houndoom that burned Norman with its flames.

Archie later indicated that Maxie died due to the Red Orb burning out his body and causing him to crumble into dust.

(Source: Bulbapedia)