I'm in love with Porygon-Z² too, +1 to all stats is so awesome. I waited for Porygon-Z to be viable again since Gen 4. Ice beams also deals with Coil Zygarde quite well, which is invaluable at the moment. He's also more bulky than he looks.
+1 0 Atk Zygarde Thousand Arrows vs. +1 0 HP / 0 Def...