Which Pokémon serves as Ditto's guide in Pokémon Pokopia?

Professor Tangrowth serves as Ditto's guide in Pokémon Pokopia.

Professor Tangrowth is a specially characterized Tangrowth who studies the damaged environment and helps Ditto understand the world. The character provides guidance as the player restores habitats and encounters Pokémon living in the abandoned landscape.

The name can be confused with the human professors who introduce players to Pokémon in other games. Professor Oak, Professor Kukui, and Professor Magnolia are all established human researchers from different regions, but Pokopia gives its guiding researcher to a Pokémon instead.

Tangrowth is normally recognized as the evolved form of Tangela, a Grass-type Pokémon introduced in Generation I and given an evolution in Generation IV. In Pokopia, the species receives a scholarly role and a distinctive title, making Professor Tangrowth one of the game's most memorable original character concepts.