I tested this out, and I was sorely disappointed. Gengar lacks the big damage capability that Empoleon has, and even the spreading ability (since 30 for P is inferior to 30 to 2 for WC). Because of that, I had difficulty OHKOing anything. I flipped much lower than 50% for Gengar's Poke-Power too, with my opponent even sometimes being able to burn me for the KO, not even activating Gengar's ability.
Bronzong just didn't help much at all. It didn't help OHKO anything either, and with Gengar taking so long to lay damage, by the time Bronzong came out, the game was already over.
it's a cute idea, but spreading doesn't win games anymore. big damage does.
edit: oops, it looks like this deck was made for this format with the DP gengar. Sorry about that.