Serena caught Sylveon as a Eevee. Eevee loved to dance, but she had a shy, timid personality as an Eevee and was afraid of
strangers. Serena tried to befriend her, but she was scared of Serena at first. When Team Rocket tried to steal Eevee, Serena risked her life to save her and Eevee did the same for her. Serena soon gained Eevee's trust and Eevee agreed to travel with Serena. She appeared again in Tag Team Inspiriation
where she battled Tierno's Blastoise, but was scared and Shauna's Bulbasaur protected her. She appeared again in Pokemon Performance Pop Quiz where she watched the Pokemon Showcase, but was scared off by Jessie's act and Serena had to calm her down. She was inspired by Serena's showcase performance and was determined to star in the showcase with her trainer. She appeared again in Cloudy Skies, Bright Future where she played with Serena's princess key. Eevee made a major appearance in XY094 where a wild Quilladan fell in love with her, but she didn't have the same feelings for him and was scared of him. When Team Rocket captured Eevee, Clemont's Bunnelby, Clemont's Dedenne, and Puni-Chan, her trainer and the others rushed to save them. Team Rocket attempted to make off with the stolen Pokemon, but their trainers rescued them and sent Team Rocket blasting off. In XY100, Eevee was to star in her first showcase and was scared, but her trainer comforted her. When she accidentally tripped and lost the showcase, she was very sad, but her trainer, Pancham, and Braixen comforted her and told her it didn't matter if they win or lose. In XY104, Serena asked Eevee if she wanted to go to a dance party hosted by Monsieur Pierre, Eevee relucatnly agreed. At the dance, she danced with Bunnelby. During a battle when Ash's Pikachu was injured, Eevee took the blow and was injured. Serena told her not to give up and this encouraged Eevee who evolved into Sylveon and won the battle with Ash's Pikachu. Serena appeared with Sylveon's feelers wrapped around her arm.
Sylveon as an Eevee loved to dance, but was very shy and scared of strangers. Serena gained her trust when she saved her from Team Rocket. Sylveon is very loyal to her trainer and tries to never let her down. Even though she is shy, Sylveon is a very loyal, caring, sweet, and friendly Pokemon. She made friends with Clemont's Bunnelby.