Flygon is scarfed, so Dragonite won't be a problem. I don't have HP Grass on NY Zone, I have HP Fire. In that case, Swampert and Gliscor wall you. I will have my Scizor be scarfed, so I could probably beat Rotom-H to the punch, unless he is scarfed too. Scizor can not do anything to Rotom-A. It will be a big problem. Gliscor could generally wall them, but not do much, seeing that Gliscors carry only Earthquake, and Zone and Scizor are both immune to toxic. I have six words for you: Baton Pass, Swords Dance and Rock Polish
You will also need some Pokemon who hit hard off the bat, to stop Setup-sweepers. This means Pokemon like Rhyperior (not Rhyperior, just like him) or Choice Banders, in which case you predicting will start to be a huge factor in how you do. It is your choice.