"The stick that Grookey holds, originally from the forest where groups of Grookey live, is imbued with special powers after being exposed to the energy within Grookey’s body. Its green fur creates energy from sunlight. When Grookey drums with its stick near wilted flowers and leaves, they regain their color."
Grookey is a mischevious Pokémon with boundless curiosity; he is always chirpy and has a tendency for jumping out his Pokéball and playing drums. He seems to be lighthearted and immature, but when it comes to battling, he seems to have the eagerness to do well.