Pokemon: Electric Tale of Pikachu! [Manga]

10-year-old Satoshi, after finding a Pikachu messing with the wiring in his house, is on a journey to become the greatest Pokemon Master and to beat out his rival, Shigeru. Along the way, he meets with many other Pokemon trainers and advisors, including water-based trainer (and gym leader) Kasumi, ground- and rock-based trainer (and gym leader) Takeshi, and others.