Daigo Tsuwabuki, internationally recognized as Steven Stone, reigns as the Hoenn region’s Pokémon League Champion and stands as a prominent scholar of Mega Evolution. Born to the Devon Corporation’s president, his deep knowledge of rare stones and geology drives expeditions to ancient ruins and collaborations with fellow researchers. He maintains a calm, reserved demeanor, tempered by a playful streak that surfaces outside high-stakes scenarios, though he shifts to stern focus when confronting crises like global threats or pivotal battles. In *Mega Evolution Special II*, he clashes with Alain in a high-stakes duel, deploying his Shiny Metagross—a partner capable of Mega Evolving into Mega Metagross. The battle highlights Steven’s tactical mastery, leveraging Psychic to repel incoming strikes and Flash Cannon to dismantle defenses. The fight halts when Lysandre intervenes, uniting Steven and Alain to probe the mysteries of a Giant Rock within ancient ruins. This artifact, tied to myths of Primal Reversion, draws Mega Rayquaza’s fury. The duo combats the enraged Legendary Pokémon but falters under its might, forcing them to pursue the vanished rock’s trail to Rustboro City. Steven’s influence extends beyond battles: he empowers young protégés like Sawyer by gifting a Key Stone and Sceptilite, and aids allies during emergencies such as Team Flare’s activation of the Giant Rock in Kalos. As Champion, he enters the World Coronation Series’ Masters Eight Tournament, engaging Ash in a strategic duel that showcases his ingenuity before conceding defeat. His rapport with fellow Champions Cynthia and Diantha underscores a collective dedication to preserving harmony across the Pokémon world. His team features a Shiny Metagross, Aron, Aggron, and Steel-type specialists. Aron assists in unearthing stones and soothing wild Pokémon, while Aggron and Metagross dominate battles. Mega Metagross’s speed and raw strength enable it to rival Legendary foes like Rayquaza. Expanded lore reveals Steven’s perilous decision to unseal Regirock, Regice, and Registeel to mediate the cataclysmic clash between Kyogre and Groudon—a gamble that nearly claims his life. After recuperating, he resumes global travels, tackling crises while amassing rare stones. Though he temporarily cedes his Champion title to Wallace, he later reclaims it, solidifying his standing as Hoenn’s apex Trainer. His charcoal jacket, red tie, and metallic accessories, including a Mega Stickpin, mirror his dual identity: a polished intellectual and a battle-hardened strategist. This aesthetic bridges his scholarly pursuits with his combat expertise, embodying a harmony of mind and might.