Once an assistant to Professor Platane of Lumiose City, Alain and his Charizard embarked on a quest to grow even stronger by mastering the power of Mega Evolution. At the request of the mysterious Fleur-de-lis, Alain and Charizard travel through Kalos and Hoenn to investigate the mysteries of this phenomenon. They seek out skilled trainers capable of using Mega Evolution to aid in their own improvement and to assist Fleur-de-lis with his research. During their travels, they encounter a young girl named Manon, who, along with her Stufful, decides to join Alain; he agrees to this reluctantly. Pokemon XY: Mega Evolution follows Alain and Charizard as they strive to become the strongest users of Mega Evolution. Along the way, they battle legendary monsters to protect Fleur-de-lis's ambitions, as well as the safety of those most important to him.