Gary Oak
From the Pokémon Encyclopedia
[edit] Background
Gary Oak (オーキド・シゲル Ōkido Shigeru?), voiced by Yuko Kobayashi in Japanese and Billy Beach in English, is Ash's rival. At first, he was arrogant, but has since become more open-minded. He and Ash grew up together in Pallet Town and quickly became rivals after becoming Pokémon trainers. Like Ash, Gary collected Gym badges and then competed in the Kanto and Johto League tournaments. After losing to Ash in the Johto League, he decides to pursue a career in Pokémon research, impeding his rivalry with Ash. During Pokémon: Diamond & Pearl, he travels to Sinnoh.
[edit] Pokémon Strategies
Gary's Pokémon strategies are almost exacly like Ash, only he spends more time raising his pokémon in good technigue and teaches them tough and cool moves, while Ash uses clever strategy during battle and teaches most of his pokémon tough and smart moves.

