Water Gun is the Pokémon move cited as refreshing thirsty plants in Pokémon Pokopia.
The game reimagines Pokémon moves as useful abilities for caring for a developing habitat. Its official description gives Squirtle’s Water Gun as an example: players can learn the move and use it to refresh plants that need water. This makes a familiar battle move part of the game’s gardening and environmental systems.
Water Gun is a Water-type move traditionally associated with Pokémon such as Squirtle. In main-series battles, it deals damage to an opposing Pokémon. Pokopia instead emphasizes its practical water-spraying function, matching the title’s slower, creative style.
The answer is not Hydro Pump or Water Pulse, even though both are also Water-type moves. Those attacks have different names and battle effects. The specific move named in the Pokopia example is Water Gun, and Squirtle is the Pokémon linked with that example.