From Bulbapedia, the community-driven Pokémon encyclopedia.
Lucianne (Japanese: ルカ Luka) is a recurring character who first appeared in Hoopa — The Mischief Pokémon. She lives in Arche Valley and is a childhood friend of Baraz and Meray.
She grew up with Baraz, Meray, Hoopa, Pit and Kevie. One day, she and her friends tried to help Old Man Dom by having Hoopa make rain appear to stop the drought. This didn't work however, as Hoopa misunderstood and let it rain candy from Mira's store instead. They were punished for this by Mira and had to help her make donuts. They later got in even more trouble, when they accidentally broke an ivory statue treasured by Mira. They tried to glue the statue, but weren't able to make it look like it did before. Mira ultimately discovered this, but she wasn't mad at them as they had done their best to repair it. Afterwards they all enjoyed the donuts they made together.
An older Lucianne made a cameo appearance in Hoopa and the Clash of Ages, where she was seen standing on a dock outside Dahara Tower. She was one of those evacuated from the space-time collapse via one of Hoopa's rings.