The celebration for your ascension to Rank A in the Z-A Royale had to be postponed because of the chaos that was about to happen in Lumiose City. Ange, the device that A-Z created, linked to his Eternal Flower Floette, got out of control, and you, with the help of Mega-Zygarde, managed to keep the weapon under control and saved the city from complete devastation. This was not possible without the help of all the allies that you did during the story, but unfortunately, A-Z's apparently eternal life came to an end after you and your friends concluded with that huge menace.
To commemorate your ascension, in honor of A-Z, and that also you basically saved the World, your friends decided to organize a huge party, and not just a small celebration with croissants n' curry! Who are going to be there? Well, the invited ones were; Your team MZ (Urbain / Taunie (depends on your gender preferences, but they're the same person), Lida and Naveen), Emma, Canari, her grandfather Tarragon, Ivor, his sister Gwynn, Corbeau, his second-in-command Philippe, Jacinthe, her maid Lebanne and other guests (except the Team Flare members, the Professor Mable, Vinnie, Jett, and obviously, A-Z). And as an act of "generosity" (more likely to take the credit and have a lot of attention), Jacinthe offered her hotel to be the main place of the party.
You find yourself here, sitting down as you see all your allies around, dancing, chatting and having a lot of fun.
Lebanne: "It is allowed for me to have fun too, ma'am Jacinthe?" she says with a forced polite smile. Jacinthe chuckles as if she said something ridiculous. Jacinthe: "But why would you do that? You have to keep attending the guests as they deserve. Come on, bring us some wines already~." Lebanne takes a deep breath, suppressing the urge to yell at Jacinthe. Lebanne: "Absolutely. My apologies for my discourtesy." she walks off to bring drinks and food.
Meanwhile, some other guests were on the main floor, dancing and having fun. Canari and Gwynn were sitting close and chatting, while Emma, Philippe and Urbain / Taunie (depends) were dancing happily, but Lida was the one showing off the most as she was literally doing breakdance. Lida (breaking it in the dance floor): "Woohoo! No more Rogue Mega Evolutions, only PARTY!!"
Naveen, watching from a short distance but without dancing, groans and gets embarrassed of Lida's extroverted tactics. Naveen (groans): "You're being too childish, stop embarrassing us..."
Canari chimes in and chuckles, winking enthusiastically and wrapping her arm around Lida. Canari: "But I do like parties! Lighten up, dear Canatic~" Lida smiles widely at Canari's agreement, and at his idol streamer's cheerful words, Naveen immediately changes his mind, getting shy, excited and needy of her approval. Naveen: "Y-You're right, Canari! Come on, Lida, show them what are you made of!"
Gwynn huffs, feeling a bit jealous about seeing others interacting with her friend, and Corbeau rolls his eyes and looks at Naveen with disapproval. Corbeau: "What a simp." and the other guests chuckle, making Naveen get embarrassed again. What are you going to do now? After all this time saving the city, defeating Rogue Mega Evolutions and being a celebrity amongst the Z-A Royale's participants, everyone already got used to you.