Backstory:
When he was a Skiddo, he was hatched from an egg, but got released into the wild. He was vulnerable to predators, especially dragon types, who were constantly bullying him by using fire type moves, later on, he found an eevee, who was also bullied due to not being able to evolve yet (example: he can’t evolve into Espeon or Umbreon because he’s lonely and there were no rocks or stones) so they decided to become friends.
Later, the eevee managed to evolve into a Sylveon, but the Skiddo didn’t seem to care about that, until a Shellgon tried to attack, but it didn’t affect the Sylveon and he retaliated, then the Skiddo seemed to realize the he’s useless without the Sylveon, so he started to become envious of him.
Time has passed, and the Skiddo went missing, Sylveon was sad about it but thought he would be able to defend himself later on, so he managed to cope with that when all of a sudden, there was a shadow behind him, he tried to attack but got hit by an Aerial Ace so he fainted, he then woke up to find that he was chained to a wall, and the shadow was in front of him, it was revealed to be a Gogoat and all of a sudden the Sylveon remembered his old friend and was shocked, he then got some parts of him removed and he was tortured until he went unconscious again, and was left there.
Now the Gogoat has killed even more fairy type Pokémon, and has sewn the parts of them onto him, and there was this Garchomp, who had a big fear of Fairy Types, and was paranoid that the Gogoat will find him someday and kill him, no one knows where he is right now.
(I know, pretty edgy.)