Steven Stone holds the title of Pokémon League Champion for the Hoenn region and is the son of Devon Corporation's president, Mr. Stone. A specialist in Steel-type Pokémon, his signature partner is a shiny Metagross capable of Mega Evolution. His deep expertise encompasses rare stones and minerals, a passion intertwined with his research into the origins of Mega Evolution. This pursuit leads him to collaborate with Lysandre of Lysandre Labs; together, they combine fragments of an ancient wooden slab to locate a legendary megalith theorized as the source of Mega Evolution energy. Within the *Pokémon: Mega Evolution Special II*, Steven encounters Alain and Mairin in Hoenn. After assisting Mairin, he accepts Alain's battle challenge prompted by Steven's Key Stone. Steven deploys his Metagross against Alain's Mega Charizard X. The battle showcases Metagross enduring super-effective attacks like Blast Burn and countering with powerful Steel-type moves such as Meteor Mash. Lysandre interrupts the clash, revealing his partnership with Steven in studying the slab. The combined text from their fragments guides them to a temple where activating their Key Stones unveils a floating pathway leading to mountaintop ruins housing the Giant Rock, a massive energy-emitting structure. The Giant Rock's emergence attracts Rayquaza, which Mega Evolves without a trainer and assaults the ruins. Steven and Alain join forces, Mega Evolving Metagross and Charizard to confront Mega Rayquaza. Despite their efforts, Mega Rayquaza's Draco Meteor devastates the site, causing the Giant Rock to vanish. Lysandre later detects energy matching the megalith near Rustboro City, prompting Steven to accompany Alain and Mairin to investigate. During this journey, Steven observes Alain's protective instincts toward Mairin, recognizing his concealed concern for her safety. Steven possesses a history of intervention during regional crises. Beyond the Mega Evolution Specials, he aids in thwarting Team Magma's eruption scheme at the Mossdeep Space Center in *Pokémon Emerald*. He also appears in other regions, informing players about roaming Legendary Pokémon in Kanto (*Pokémon HeartGold and SoulSilver*) and gifting Hoenn starter Pokémon. In Kalos during the Team Flare crisis (*Pokémon the Series: XYZ*), he allies with Ash and others against Lysandre's forces, applying his geological knowledge to analyze the Giant Rock's properties and coordinate defensive strategies. The manga *Pokémon Adventures* depicts Steven's sacrificial nature. During the clash between Groudon and Kyogre, he uses the Regi trio to contain their catastrophic energy, dying from the strain. A Celebi-enabled alternate timeline later restores him to life, after which he passes the Champion title to Wallace and continues his stone-collecting journeys. This willingness to face lethal threats for the greater good recurs as a character trait. Personality-wise, Steven is calm, intellectually curious, and reserved. He frequently questions trainers about their motivations and methods, partly to gather insights for Devon Corporation's products. Though socially reserved, he values Pokémon bonds and strategic battles. His commitment to mineralogy and Pokémon training shapes his actions, from unearthing fossils to refining his team's capabilities. Outside the Mega Evolution Specials, Steven maintains a presence in competitive circuits. He ranks among the world's top trainers in the World Coronation Series (*Pokémon Journeys: The Series*). His battle proficiency endures across media, exemplified by his Metagross's adaptability and tactical use of Pokémon like Cradily employing Ingrain for recovery and Power Whip for offense.