Bulbasaur’s Leafage helps restore greenery in Pokémon Pokopia.
Pokopia gives Ditto practical access to abilities associated with Pokémon friends. After befriending Bulbasaur, Ditto can use Leafage to add green patches to the otherwise withered landscape. The move therefore functions as a world-building tool rather than simply as a battle attack.
This mechanic reflects the game’s central idea: Pokémon abilities help rebuild a damaged habitat. Different Pokémon contribute different kinds of assistance, so befriending them expands what the player can do while developing the settlement.
Leafage is easy to mix up with other Grass-type moves, especially Vine Whip and Razor Leaf. In Pokopia’s officially described example, the specific move connected with Bulbasaur’s greenery is Leafage. The example is about restoring the environment, not winning a conventional Pokémon battle.