Bella's Sylveon

Clarissa's Sylveon is a Pokémon she obtained Kalos.

As a Wild Pokémon
Sylveon is revealed to belong to a trainer who wanted a Leafeon and not a Sylveon. The trainer abanndoned Sylveon on Kalos Route 18 leading the Fairy-Type's bitter opinion of humans. Later she was injured by a Larion which resulted in her capture by Clarissa so she can be healed. Inver healed the Intertwining Pokémon and revealed Sylveon's story.

Sparks: XYZ
Sylveon aided Clarissa in her battle against Team Flare and was upset upon seeing her turned to stone.

Personality
Sylveon has a strong distrust towards humans other than Clarissa and Inver. She is very protective over any Pokémon and especially Jax's Eevee, whom reminds her of herself when she was younger.