It should be said that SubCM Raikou is extremely powerful in this metagame. Although it's become predictable, people somehow never carry enough counters/checks to it. Then there's the fact that one can carry other powerhouses such as Kingdra or Chandelure, which clear the way for Raikou and can sweep themselves.
I also think Nidoking is the best SR setter. It's not just a one-time pony as it can still hit pretty much the whole metagame with just 3 moves. It works especially well against stall teams in my experience.
And I still can't believe how little Rotom-H is used. With a scarf or Specs attached, it has the opportunity to defeat or cripple almost every opposing Pokemon with either powerful STABs, an unexpected HP Grass and Trick. Use it more often people!!!