Right know I have been using Pixie Plate Sylveon since it avoids recoil damage and can switch up its movesets. Here's my Sylveon set.
Sylveon @ Pixie Plate
Ability: Pixilate
Level: 50
Evs: HP 100 / Def 116 / SpA 252 / SpD 4 / Spd 36
Modest:
Hyper Voice
Hyper Beam
Quick Attack
Light Screen
Sylveon @ Pixie Plate
Ability: Pixilate
Level: 50
Evs: HP 100 / Def 116 / SpA 252 / SpD 4 / Spd 36
Modest:
Hyper Voice
Hyper Beam
Quick Attack
Light Screen