It converts sun light into energy. In the darkness after sunset, it closes its petals and becomes still.
In the daytime, it rushes about in a hectic manner, but it comes to a com plete stop when the sun sets.
As the hot season approaches, the petals on this POKéMON's face become more vivid and lively.
SUNFLORA converts solar energy into nutrition. It moves around actively in the daytime when it is warm. It stops moving as soon as the sun goes down for the night.
SUNFLORA convert solar energy into nutrition. They are highly active in the warm daytime but suddenly stop moving as soon as the sun sets.
— Pokédex entries (via PokeAPI)