@Lorisaur Hyper Offensive Rainbow with Pelipper/Politoed + Ninetales/Torkoal. You can lead with Torkoal for rocks if you feel like it, but blazing your oponent with boosted Tri Attack Adaptability Porygon-Z and/or Boomburst Noivern/Chatot is usually the way I play with it. My Rainbow Field Team had Ninetales/Politoed because I mostly used it under Gen 6 mechanics (aka E16...?).
As far as I know, yeah, Serene Grace does stack with Icy Field (say hello to Secret Power Sawsbuck ) but it seems like it only stacks if given pokemon is grounded, so no flinchhax Togekiss for ya m8.
#EDIT: Nevermind, I'm dumb. It doesn't stack. But still, Sawsbuck in Icy Field has 60% freeze chance with Secret Power so it's still pretty broken af.