Which named Pokémon acts as a professor in Pokémon Pokopia?

Professor Tangrowth acts as the professor in Pokémon Pokopia.

This character is a Tangrowth who has given himself the title “Professor Tangrowth.” He studies the damaged environment and investigates the mystery of why humans and Pokémon left the world. His research helps establish the game's post-apocalyptic story.

Professor Tangrowth meets Ditto after Ditto has found an old Pokédex and taken a human-like form. Together, they begin restoring habitats so Pokémon populations can recover. Tangrowth therefore fills a role similar to a Pokémon professor in other games, but the character is himself a Pokémon rather than a human scientist.

Players may confuse him with familiar human professors such as Professor Oak because Pokémon games often introduce their worlds through researchers. Pokopia deliberately changes that convention: its professor is a talking Tangrowth involved directly in the rebuilding effort and the investigation of the abandoned landscape.