Which Pokémon co-leads the restoration investigation with Ditto in Pokémon Pokopia?

Professor Tangrowth co-leads the restoration investigation with Ditto in Pokémon Pokopia.

Professor Tangrowth is a Tangrowth who has taken responsibility for studying the game’s damaged environment. After Ditto arrives in the abandoned world, the two join forces to investigate why humans and Pokémon disappeared.

The character gives the story a research-focused perspective. While Ditto restores habitats and helps Pokémon directly, Professor Tangrowth examines the larger environmental mystery and the remains of the former world.

The name can be confused with the professors from the main Pokémon games, many of whom are human researchers associated with a region or Pokédex. Pokopia instead presents a Pokémon researcher: a Tangrowth known as Professor Tangrowth.