Cosette is a character appearing in the XY series.
Season 17: XY
Cosette is one Professor Sycamore's assistants who appeared in Lumiose City Pursuit!.
Season 18: XY Kalos Quest
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Season 19: XYZ
Cosette was seen watching the Pokémon Showcase Master Class on television along with Professor Sycamore and Sophie. She also voted for the best performance for each round.
XY Kalos Quest
Prof. Sycamore, Sophie and Cosette watching Serena's Showcase.