In Pokémon Pokopia, Ditto can learn Water Gun from Squirtle to hydrate plants. The move turns a familiar Pokémon attack into a useful tool for gardening and environmental care.
Water Gun is associated with Squirtle because it is one of the original Kanto starter Pokémon and a Water-type species. In the game’s peaceful setting, the move is not primarily presented as a way to defeat opponents. Instead, it helps the player maintain plants and cultivate the landscape.
Psyduck, Totodile, and Mudkip are also Water-type Pokémon, so they may seem plausible as answers. However, the specifically highlighted example pairs Water Gun with Squirtle. This illustrates Pokopia’s broader design: Pokémon abilities become practical actions that help Ditto construct a comfortable habitat for the community.