Which Pokémon spin-off was the first game developed entirely in-house by Game Freak?

Pokémon Quest was the first Pokémon spin-off developed entirely in-house by Game Freak.

The game was announced and released for Nintendo Switch on May 30, 2018, with mobile versions following on June 27. It is an action role-playing game set on Tumblecube Island, where Pokémon appear in a distinctive blocky, voxel-inspired style. Players explore areas, battle wild Pokémon, prepare dishes to attract new creatures, and improve teams with Power Stones.

Pokémon Quest focuses on the original Kanto lineup rather than presenting a new regional Pokédex. Its visual design gives familiar Pokémon cube-shaped bodies, sometimes called Pokéxel characters. The automated battle system and base-camp mechanics also distinguish it from the turn-based main series.

The title is often confused with Pokémon Snap or Pokémon GO because those games are also spin-offs. However, Pokémon Quest has a specific development distinction: it was the first spin-off made entirely in-house by Game Freak, the studio behind the main Pokémon role-playing games. That makes it a notable milestone in the franchise's expanding game history.