Sylveon was used as Valerie's first Pokémon in a gym battle against Ash. It fought against Ash's Fletchinder and it was able to deliver several blows to Fletchinder but also take some of Fletchinder's Steel Wing. Sylveon used several attacks on Fletchinder and even wrapped Fletchinder up with its scarf-like appendages. It then used Fairy Wind to damage Fletchinder further but Fletchinder was able to escape. Sylveon then used Giga Impact while Fletchinder used Steel Wing and both Pokémon collided. Sylveon however was the one who had fallen and was defeated.
Valerie and her Pokémon, including Sylveon, watched Lysandre's broadcast from Lumiose City.
|Disarming Voice||Fairy-Type Trickery!|
|Fairy Wind||Fairy-Type Trickery!|
|Giga Impact||Fairy-Type Trickery!|
|+ indicates this Pokémon used this move recently.*|
- indicates this Pokémon normally can't use this move.