Ninfia, known as Sylveon in English-language media, debuts in the Pikachu short "Eevee & Friends" as a new evolution of Eevee, marking its first anime appearance.

Sylveon greets Pikachu playfully by covering his eyes, establishing its friendly and curious nature. It then guides Pikachu and his companions—Oshawott, Pansage, and Axew—to the Eevee House, acting as their welcoming host.

Within the Eevee House, Sylveon actively maintains group harmony. It intervenes to separate Jolteon from Oshawott after an accidental electrocution and later chases Oshawott to prevent further disruption in Glaceon and Leafeon's rooms. Sylveon also facilitates group activities. Noticing Umbreon's absence during the talent show, it locates the missing Pokémon and assists Umbreon, Weavile, and Gible in creating a cosmic light display, contributing to the shared celebration. When Meowth and Wobbuffet mistakenly perceive Umbreon's group as threatening, Sylveon uses an attack to blast them away.

The short implies Sylveon holds a special status among the Eeveelutions, likely due to its then-recent introduction as the Fairy-type evolution. Contextual cues, such as Oshawott and Meowth's infatuated reactions, strongly suggest Sylveon is female. Its design and demeanor made it a focal point for fans of Eevee and its evolutionary line within this production.

The narrative concludes with Sylveon sharing a quiet moment of connection with Pikachu as the group settles into sleep.