Which game inspired Pokémon Pokopia director Shigeru Ohmori's idea for player-made Pokémon habitats?

Pokémon Ruby and Sapphire inspired Shigeru Ohmori's idea for player-made Pokémon habitats in Pokémon Pokopia.

Ohmori was a map designer on Pokémon Ruby and Sapphire, and his early work on that pair of games influenced the concept behind Pokopia. He considered how appealing it would be for players to create and cultivate habitats for Pokémon themselves, rather than simply traveling through fixed routes and towns.

That idea became the foundation for Pokopia's building-focused design. Players gather materials, shape landscapes, construct homes, and arrange environmental features that attract particular Pokémon. The game turns the map-making perspective into a direct player activity.

Pokémon Ruby and Sapphire are Generation III games originally released for the Game Boy Advance. They are sometimes confused with Pokémon Scarlet and Violet because Ohmori later directed those games, but the stated inspiration for Pokopia came from his earlier map-design experience on Ruby and Sapphire.