Yveltal's Orders

Set up Yveltal on your bench, leaving Volanion or Cresselia in the active spot. Then either retreat to move Yveltal up or use Guzma which would save you an extra step. Either use the second effect on Guzma or a Switching card to bring up whichever card your opponent has been setting up. Use Amazing Destruction to instantly destroy all of their progress. Then continue to KO whatever they bring up until they start setting up again, at which point you switch in the card they're setting up,

Set up Yveltal on your bench, leaving Volanion or Cresselia in the active spot. Then either retreat to move Yveltal up or use Guzma which would save you an extra step. Either use the second effect on Guzma or a Switching card to bring up whichever card your opponent has been setting up. Use Amazing Destruction to instantly destroy all of their progress. Then continue to KO whatever they bring up until they start setting up again, at which point you switch in the card they're setting up, and KO it. Repeat until you win.