Shigeru Ookido

As the grandson of Professor Oak, this talented trainer began his journey as an arrogant, overconfident rival to Ash. Though their childhood bond as neighbors faded during their early Pokémon adventures, their intense competitive relationship defined the Kanto and Johto eras. Over time, he matured from a show-off into a humble researcher and mentor. Utilizing powerful Pokémon like Blastoise and Umbreon, he pushed Ash to grow, eventually transitioning from a fierce competitor to a respected, lifelong friend.