It seems there might be some confusion regarding the events and transformations in the "Miraculous: Tales of Ladybug & Cat Noir" series. Let’s clarify the scenario you described:
In the series, Ladybug (Marinette Dupain-Cheng) and Cat Noir (Adrien Agreste) are Paris's superheroes, fighting against the villain Hawk Moth (Gabriel Agreste), who seeks to obtain their Miraculouses.
In the context of transformations, Ladybug transforms using the Ladybug Miraculous, while Cat Noir uses the Cat Miraculous. If Hawk Moth attempted to seize Cat Noir's Miraculous and Ladybug transformed into a variant (such as Lady Noir), it would typically be a result of the narrative pushing them into a tight situation.
In your scenario, if Ladybug manages to take the Cat Miraculous and transform into Lady Noir, it indicates a pivotal moment in their battle against Hawk Moth. The destruction of the Butterfly Miraculous would also be significant, affecting Hawk Moth's powers and plans.
It's important to note that the series often features twists and turns, with transformations and their consequences being integral to the plot. If this summary doesn’t match what you were looking for, please provide more context or details, and I would be glad to help clarify!