What is the name of the Pokopia character who studies the environment?

The environment-studying character in Pokémon Pokopia is Professor Tangrowth.

Professor Tangrowth is a Tangrowth who has made environmental research his mission. After Ditto arrives in the abandoned world, the two meet and work together to understand why humans and Pokémon disappeared and how the damaged habitats can be restored.

The title “Professor” is part of the character's name in the game's story, separating him from the better-known human Pokémon professors such as Professor Oak or Professor Juniper. Professor Tangrowth is also unusual because he is a Pokémon researcher rather than a human scientist.

Tangrowth's role connects the plot to Pokopia's central activity. Restoring habitats is not merely decorative construction: it helps the Pokémon population recover and makes it possible for more species to appear. Professor Tangrowth provides the investigative context for that rebuilding mission.