The Gengar VMAX/Single Strike Urshifu VMAX deck focuses on having 2 attackers in Gengar VMAX and Single Strike Urshifu VMAX for different matchups. For matchups like Duraludon VMAX, Jolteon VMAX, Eternatus VMAX, and Rapid Strike Urshifu VMAX, you want to use the Single Strike Urshifu VMAX. Single Strike Urshifu VMAX's G-Max One Blow attack does 270 damage. Single Strike Energy's effect gives the Pokemon the Energy is attached to the ability to do 20 more damage. The G-Max One Blow attack can go through Pokemon like Zamazenta V and Duraludon VMAX. For most of the other matchups, you want to use Gengar VMAX. Gengar VMAX's G-Max Swallow Up attack does 250 damage but you don't discard your Energy cards unlike Single Strike Urshifu VMAX's G-Max One Blow attack. I hope you enjoy this decklist and feel free to comment down below if you have a card suggestion for this list or a deck suggestion!