Which Pokémon gives Ditto the Water Gun move in Pokémon Pokopia?

Squirtle gives Ditto the Water Gun move in Pokémon Pokopia.

Pokopia lets Ditto learn moves from Pokémon it befriends. These moves are practical tools for rebuilding the environment, rather than merely attacks used in conventional Pokémon battles. Squirtle’s Water Gun allows Ditto to water dry plants and support the restoration of habitats.

The story introduces Squirtle after Ditto helps it recover from dehydration. This encounter leads to a broader task: restoring habitats so the Pokémon population can recover. Water Gun therefore connects the narrative and gameplay, turning Squirtle’s signature move into a useful environmental ability.

Squirtle’s evolutions, Wartortle and Blastoise, are separate Pokémon, so they are not the precise answer. The move-teaching encounter in Pokopia specifically centers on Squirtle.