Hello eggsalad63, I have completed your request - thank you for your patience!
I'm not gonna sugarcoat it: This Gengar set has not worked out too well for me. I suppose on paper Cursed Body + Disable sounds like it would be somewhat annoying to face but without Shadow Tag the opponent can too easily take advantage of it by switching on Disable turns (gotta take advantage of that by subbing twice instead occassionally but that appears to drain its health rather quickly). The only change I made to the moveset is using Sludge Wave over Sludge Bomb - didn't want it to be walled by Bulletproof 'mons. Anyway, I gave it a go and this is what I came up with.
"Blue Purple" Disable Gengar Balance
http://pokepast.es/c0f1fb16835fd39c
The very first partner I singled out for Gengar is
Cobalion. It takes advantage of Dark type attacks that are aimed at Gengar and acts as a Knock Off absorber with a Z-Crystal equipped. Additionally, with this Gengar set it is often important to switch with a Subsitute up versus the likes of Muk-A, CB Scizor and Krookodile to avoid being Pursuit trapped, all of which Cobalion has an easy time setting up on. This Gengar set is still very much annoyed by Gliscor from my experience, despite disabling Earthquake it will never beat it without SpDef drops from Shadow Ball (which in a 1v1 scenario is rather likely to happen but early to mid game you generally want to throw out attacks to hit switch-ins as soon as you disable the EQ). The Cobalion is thus designed to take advantage of all the Stealth Rock + Toxic Gliscor running around. With
Magnet Rise it turns them into set up fodder and can utilize the stronger All-Out Pummeling instead of Corkscrew Crash, which is especially helpful for dealing with Swords Dance Scizor. I had Taunt over Magnet Rise on Cobalion before to pressure stall builds better (prevents Quagsire from recovering damage so that it can be overwhelmed by an All-Out Pummeling the next time it is forced in), but the team was too vulnerable too Gliscor without Magnet Rise so I opted for the latter.
Swampert and Empoleon make up the primarily defensive and hazard control core of this team. Roar on Empoleon over additional coverage to phaze out Serperior that hope to grab a free evasion boost but since TR is so prevalent on the ladder at the moment it has good applications versus that as well. At this point the team was looking to be struggling with Serperior quite a bit due to the offensive nature of the team's Poison type and the defensive dual Water type core. Bulky Dragon Dance
Mega Altaria helps versus that. It has enough speed to outpace Serperior after a Dragon Dance boost and OHKOes with Pixilate boosted Double-Edge.
Fire Blast helps to lure and smack steels, Scizor and Doublade in particular, which can give the team a bit of trouble. The defense EVs ensure to survive a +2 Life Orb boosted Crabhammer from Crawdaunt after Stealth Rock damage (which has actually come into play versus TR), while 24 special defense EVs help with some odds versus Serperior when already in Mega form. Choice Scarf
Hydreigon rounds out the team as a great revenge killer, offensive pivot and Ground immunity. Be careful around BD Azumarill with it since it's the only member of the team that thing can set up on.
Overall, the team features multiple dual type cores which I wanted to experiment more with for some time now and I'm content with the result. If you're having too much trouble versus fat with this team feel free to utilize Taunt Gengar or even Choice Specs Trick instead. Anyway, you shouldn't run into too many problems with this, I played some games earlier on the higher end of the ladder with it and it performed quite well. Have fun!