After my experience at Florida Regionals, I added in a second Cobalion after going against 3 Volcanions. In a normal skeleton list, there really isn't an out to Volcanion other than cobalion. I only ran 1 at the time and tried super rodding it in repeatedly, but that wasn't the best. As for my experience on Wailord, I don't think it will be a big contender anyway so at least for now it isn't a big problem. In case it does turn big, make sure you run 2 Lysandres and probably a Delinquint would be good too.