Pokémon's Master of Rain

The fishing enthusiast Caster finds himself in the Pokémon world, not only as an orphan but with a starter Pokémon that's nothing more than a Magikarp that only knows Splash. Talk about a catastrophic beginning! Fortunately, whenever Caster catches a Pokémon, he receives orb rewards. [Caught Magikarp, rewarded 1 Energy Orb.] [Caught Poliwag, rewarded 1 Rain Dance TM.] [Caught Dragonite, rewarded 1 Attack Enhancer.] [Caught Kyogre, rewarded 1 Indigo Orb.] ... From that point on, Caster fishes his way through the Pokémon world, and his journey as a trainer takes a completely unexpected turn. Years later, a mysterious trainer rises to power with unstoppable force, crushing regional champions left and right and taking down Mythical and Legendary Pokémon alike. — Description from novelcodex.org