Pokemon: As Cynthia's Fiance

Samuel, unexpectedly finds himself transmigrated into the vibrant Pokémon world. Years later, he's a top researcher at Celestic Laboratory, engaged to Sinnoh Champion Cynthia. With a Champion-level Lucario, a system, and hidden Pokémon knowledge, Samuel tames legendaries, solves ancient mysteries, and casually crushes evil teams. Team Rocket and Galactic join forces? Darkrai goes berserk? Cynthia wants a Mega Stone? No problem. Her fiancé will handle it. — Description from novelcodex.orgFull novel: Pokemon: As Cynthia's Fiance — read the rest free on N​o⁠v​e⁠l​C⁠o​d⁠e​x⁠.​o⁠r​g⁠