It seems like you are discussing events from the animated series "Miraculous: Tales of Ladybug & Cat Noir." In the series, Hawk Moth, also known as Gabriel Agreste, is a recurring antagonist who uses the Butterfly Miraculous to create supervillains by akumatizing people.
In Season 6, if Ladybug transforms into LadyNoir after defeating Hawk Moth, it signifies a significant moment in the storyline. Ladybug, typically utilizing the Ladybug Miraculous, may adopt aspects of Cat Noir’s powers or persona. Dropping the Butterfly Miraculous afterward suggests a pivotal shift, possibly indicating the conclusion of a battle or a turning point in their ongoing conflict.
If there are specific details or events you’d like me to clarify or discuss further, please let me know!