well im p sure sub cm keldeo and ebelt volcanion single handedly solo that team, like both of them can almost do 1v6 and especially volcanion. The Flying core can be outplayed by bisharp and heatran, the second core is a psychic core and even tho sub hoopa can be terrifying and especially with that coverage there is a doublade and a bisharp on the team that can keep attacking hoopa and breaking its subs, even scizor can do it and ofc victini drops to bisharp. The dark core looks decent as well but its not as safe as the water core. I think that the best way to deal with it is therefore the water core.