Which two companies co-developed Pokémon Pokopia with The Pokémon Company?

Pokémon Pokopia was co-developed by Game Freak and Koei Tecmo with The Pokémon Company.

Game Freak is the studio most closely associated with the main Pokémon video-game series, while Koei Tecmo contributed expertise from its development teams, including Omega Force. The collaboration was important because Pokémon Pokopia uses sandbox construction and life-simulation ideas that differ from the traditional Pokémon role-playing formula.

The project began from an idea associated with Shigeru Ohmori, who had worked on Pokémon Ruby and Sapphire and wanted players to create Pokémon habitats. Game Freak did not have as much experience in the sandbox genre, so Koei Tecmo’s involvement helped bring those building-focused concepts to life.

Nintendo published the game internationally, but Nintendo is not one of the two co-developers requested here. Creatures is also a major Pokémon company, yet the development partnership identified for Pokémon Pokopia names Game Freak and Koei Tecmo.