Sylveon @ Leftovers
Ability: Pixilate
EVs: 252 HP / 120 Def / 136 SpD
Calm Nature
IVs: 0 Atk
- Wish
- Protect
- Hyper Voice
- Heal Bell / Mystical Fire
Sylveon is a counter to Specs Kyurem
252+ SpA Choice Specs Kyurem Ice Beam vs. 252 HP / 136+ SpD Sylveon: 159-187 (40.3 - 47.4%) -- 2% chance to 2HKO after Stealth Rock and Leftovers recovery
252+ SpA Choice Specs Kyurem Freeze-Dry vs. 252 HP / 136+ SpD Sylveon: 123-145 (31.2 - 36.8%) -- 77.4% chance to 3HKO after Stealth Rock and Leftovers recovery
252+ SpA Choice Specs Kyurem Earth Power vs. 252 HP / 136+ SpD Sylveon: 106-125 (26.9 - 31.7%) -- guaranteed 4HKO after Stealth Rock and Leftovers recovery
Even if Sylveon was slightly chipped or Spikes were up, a Protect will help survive even better thanks to Leftovers.
As for Sylveon's spot in the meta, it has a niche in walling a good amount of special wallbreakers aside from Tapu Lele and Nidoking. It can wall Dragapult, Kyurem, and Hydreigon, but also can pivot into Koko or Tornadus-T. It can take a hit from SOME physicals attackers like Zeraora as well. Most of all, it can use Slowbro & Slowking's future sight teleport strategy against them by spreading Wishes.