Serena chose Fennekin as her starter Pokemon. Ever since then, Fennekin and her trainer have been inseparable. Fennekin is a target to Team Rocket who tries to capture her a couple of times. During a battle, Fennekin evolved into Braixen. Braixen is one of Serena's most used Pokemon.
Fennekin is loyal, friendly, and caring to her trainer. She cares about her trainer very much and goes to great lengths to impress her.