I don't think you should worry about doubling types for in-game too much tbh. And having a Ghost is always great.
I'm using 2-3 Dragons (rotating) with Tyrantrum, Goodra and Charizard X, and we don't even have everything yet. I'm also using 2 Ghost types with Gourgeist and Aegislash and most probably another one if it exists. I'M SO EXCITED!
I suppose so its worth a try I guess. I'm really here for the Grass/Ghost combo - it will slayyyyyy !