Where did humanity go after Pokémon Pokopia's world became inhospitable?

In Pokémon Pokopia, humanity departed for outer space after the world became inhospitable.

The game's backstory describes various unexplained phenomena that gradually made the landscape unsuitable for life. Humans left the planet but could not take their Pokémon with them, so they stored the Pokémon in a massive computer system designed to continue operating after their departure.

The computer system could release Pokémon if it began to fail, which explains why Pokémon remain central to the abandoned world. Ditto encounters logs left by humanity, allowing the player to piece together what happened without receiving the entire history as a conventional exposition scene.

This setting gives Pokopia its post-apocalyptic background, although the game presents the reconstruction story in a gentle, family-friendly way. The focus is on restoring habitats and creating a welcoming community rather than on combat or survival horror.