Okay, first off, get rid of that 252 speed. It makes his speed mediocre at best, and plenty of OU threats will out speed him anyway. Also, Bullet Punch relies on priority, not speed, so that's a wasted moveslot if you're going for a speedy sweeper.
Give 'em 252 Def, and replace Jolly nature for Adamant or Impish(your choice between Def or Attack).
Also, I would replace Zen Headbutt for Brick Break.
Replace Brick Break for Crunch or Shadow Claw to take care of that Ghost weakness LeBoss mentioned.
Also seriously consider Choice Scarf or Choice Band.
Uh, nothing to add except that I would replace Choice Specs. Go Leftovers or Expert Belt.
Take off Choice Band and go Expert Belt or Life Orb if you have Mach Punch. Just beware of Life Orb AND Flare Blitz recoil.
Also, I would take off Thunderpunch and do, say, Endeavor. Sounds crazy, right? But just think...Flare Blitz has your HP low, you use Endeavor on a high HP opponent..and maybe get a Mach Punch in there if they don't switch.
I know Thunderpunch was Iron Fist boost and Water coverage, but let Gengar be your water coverage guy. He has Giga Drain. And with Shadow Ball there, Jellecent will be saying "bye bye!".
What on earth is HP Bug doing for you? Replace that with...hm...You know, I'm actually going to replace almost your whole set. Shadow Sneak(physical), low Attack, and no Attack investments don't go. Lum Berry's not doing a whole ton either. I mean, sure, it protects you from status, but there are so many better items for Spiritomb..
Go with this:
252 SpeA, 252 SpeDef, 4 Def
Ahhhh, how I love Confuse Ray. This is your Bulky Special Sweeper. He/she adds a little Team Support with Confuse Ray, Destiny Bond goes with his low HP, and Dark Pulse is STAB. Psychic is that little booster.
If you don't like confusion, go with Wil-O-Whisp.
Froslass isn't doing it for your team. Sorry Froslass, but you will have to wait 'till another time.
Also, CSH, your moveset for her conflicts with itself.
@ Focus Sash
252 SpeA, 252 Speed, 4 HP
Yeah, I know, adds to the Ice Weakness, but I really think that The Dark Dragon will help out with your team. Plus, he's a Special sweeper, like Froslass.
Flamethrower over Fire Blast, because we wouldn't want an enemy Ice Type to laugh at a miss, now would we?
Dark Pulse is STAB. (can you take that Ghosties?)
Dragon Pulse is STAB and hits other Dragons.
Surf+Levitate gets rid of Ground Types that slightly threaten your team. You can go Charge Beam if you want more Water Coverage.
Focus Sash makes up for that fact that one good hit from a counter could KO this guy/gal.
I'm sorry that I didn't finish this earlier. I did, but for some reason it logged me out when I clicked "Save changes", and I lost all that I wrote.
Good Luck with your team! Maybe I'll help you test it sometime. ;)