Pierre Rochard, recognized as Steven Stone, reigns as the Hoenn region’s Pokémon League Champion and heir to the Devon Corporation presidency. A gemmology authority with a tactical affinity for Steel-type Pokémon, he commands his trusted Métalosse (Metagross) as his signature partner. His pursuit of Mega Evolution’s mysteries leads him to ally with Alain and Lysandre in anime specials, where their shared fascination with ancient energy sources drives them to trace the phenomenon’s roots.
During a Hoenn expedition, Pierre crosses paths with Alain and Mairin, sparking a clash between his Méga-Métalosse and Alain’s Méga-Dracaufeu X. Lysandre halts their battle, unveiling their joint mission to locate the Giant Rock—a megalith theorized as Mega Evolution’s origin. Pierre deciphers clues through his mastery of ancient texts and artifacts, guiding the trio to channel their Key Stones’ combined power, unveiling a hidden path to the monolith.
The megalith’s activation inadvertently awakens Primal Groudon and Primal Kyogre, whose cataclysmic feud endangers Hoenn. Pierre and Alain unite against the rampaging legends, deploying their Mega-Evolved allies in a fierce counterattack. The crisis peaks with Méga-Rayquaza’s sudden intervention, quelling the primal titans. Pierre’s analytical rigor remains pivotal as he aids in stabilizing the megalith’s energy and probes its ties to Zygarde during later Kalos incidents.
Outside the Mega Evolution arc, Pierre confronts Team Flare’s global schemes, leveraging Méga-Métalosse’s strategic prowess alongside fellow Champions to safeguard both human and Pokémon communities. He nurtures emerging talent, exemplified by gifting protégé Liam a Key Stone, underscoring his dedication to mentoring future generations.
In select game narratives, Pierre steps down as Champion to delve into mineral research, though his battle prowess endures. Across all media, he embodies composed intellect, relentlessly pursuing knowledge while balancing scholarly curiosity with decisive action against threats to global stability.