Selene is the female protagonist that players control in Pokémon Sun, Moon, Ultra Sun, and Ultra Moon. While visiting the Altar of the Moone,
Nebby (Cosmoem) evolved into
Nebby (Lunala) after
Lillie held a ritual and played a Sun Flute while
Selene played a Moon Flute and a beam came from the Altar tower, directly aimed at
Nebby (Cosmoem) causing Nebby to evolve into Lunala.