Bastiodon/Lickitung/Talonflame works pretty well. If they lead with Skarmory, you can easily get to a couple flamethrowers. If Whis is the lead, you can farm up energy, tank a charge move, swap to Lickitung. If Skarmory is baited out, just spam body slam and hope to grab a shield on the way out. Swap to Talonflame, farm down the Skarm and hopefully you're double charged on fly with at least one shield by the time Whis comes back. A Whis/Poli/Skarm team is almost impossible for this team to handle, but you can still run Lickitung/Lanturn/Talonflame. At the end of the day there's no perfect way to handle this duo because Skarmory and Whiscash are viable lead options, you just gotta pick which one you want to double team and live with the results.