Masuda introduced Abilities and Natures to the Pokémon series, adding layers of strategy and complexity to Pokémon battles. This innovation increased the depth and replayability of the game.

Masuda has been instrumental in refining the battle mechanics, Pokémon stats, and type matchups in the Pokémon games, ensuring a balanced and engaging experience for players.

Masuda oversees the implementation of new features and mechanics in later Pokémon games, adapting the game to the needs of different platforms and audiences. He played a role in the introduction of Mega Evolutions and Z-Moves, among others.