Sylveon

The Intertwining Pokemon shows off its amazing Fairy typing, which gives it only weaknesses to Poison and Steel as well as an immunity to Dragon-type moves, allowing Sylveon to check Mega Salamence in the Battle Spot metagame. Sylveon is very straightforward and an easy-to-use Pokemon with Choice Specs. It has an excellent Special Attack stat and has great special bulk, which helps it deal enormous damage while taking hits from other special attackers. Sylveon also has access to Pixilate, which changes its Normal-type moves to Fairy, thus giving them STAB. This allows it to utilize a boosted Hyper Voice to hammer through many threats that don't resist it such as Garchomp and offensive Landorus-T.

However, Sylveon's Poison- and Steel-type weaknesses are exploited by many threats such as Mega Gengar, Aegislash, Excadrill, Mega Mawile, and Scizor. Despite Sylveon's impressive health, its physical bulk is too poor for it to take several powerful physical attacks. Sylveon also lacks a wide movepool, leaving its options limited and predictable against other players. Sylveon's Speed is very low as well, and it normally doesn't run much Speed investment either, so even defensive threats such as Heatran, Venusaur, and Suicune can outspeed it.