Tangrowth is the lone resident found after the world withers in Pokémon Pokopia. The game’s opening premise says that Pokémon and people once lived happily together, but the humans are gone and only a lone Tangrowth remains.
Tangrowth’s role helps establish the abandoned-world setting before the rebuilding begins. After Ditto wakes from a long slumber, the player encounters this solitary Pokémon and begins restoring the desolate environment. The story then develops around creating a welcoming place where more Pokémon can live together.
Tangrowth is easy to confuse with other plant-themed Pokémon, especially Venusaur or Torterra. Those species may fit the game’s nature-focused atmosphere, but the named lone resident is specifically Tangrowth. Tangrowth is a Grass-type Pokémon introduced in Generation IV, and its vine-covered appearance makes it visually suited to Pokopia’s overgrown, damaged world.