What engine did Pokémon Pokopia use for its development?

Pokémon Pokopia used the Katana Engine for its development.

The engine is the technical engine identified in the game’s published information. Pokopia’s development involved Game Freak and Omega Force, a Koei Tecmo studio with experience in sandbox-style games.

The collaboration was significant because Game Freak wanted to create a Pokémon experience centered on cultivating habitats and building a world. Omega Force’s previous work, including Dragon Quest Builders 2, was cited as relevant experience for the project’s sandbox direction.

Pokopia’s engine supports the practical systems behind that design: constructing spaces, changing habitats, interacting with Pokémon, and presenting a world that changes through time. The answer is specifically the engine name, not the publisher, developer, or Nintendo hardware on which the game runs.