Hello! I will try to help as much as I can with this team. It looks good, so I may not have too many suggestions.
In competitive play, Gengarite is banned, so I am assuming this is just for against friends. I recommend using Dazzling Gleam over Giga Drain. Maybe also swap the SpDef and Spd Ev's.
Use Modest or Timid Nature. Give it a Focus Sash or Choice Scarf if you want to nbe in competitive play, that way he can revenge kill. Fitting for a Ghost-type.
You definitely need a Rapid Spinner on this team if you're going to use Talonflame. Try:
EV's: 252 SpAtk, 252 Spd, 4 SpDef
Trait: Natural Cure
-Thunderbolt/Grass Knot/Power Gem
Or, for something bulkier:
EV's: 252 HP, 128 SpDef, 128 SpAtk
Trait: Liquid Ooze/Clear Body
Or if you remove Gengar's Gengarite:
EV's: 252 HP, 128 SpAtk, 128 SpDef
Trait: Torrent/ Mega Launcher
There. If you want to keep Clawitzer, try Modest Nature.
Use Gale Wings Adamant Nature. Replace Fire Gem for Life Orb and Flamethrower for Flare Blitz. Put Special Attack EV's into HP. If you keep Clawitzer, replace him for Infernape, a great Fire type with no SR weakness. Use this set if you do:
Infernape @ Assault Vest
EV's: 252 Spd, 128 SpAtk, 128 Atk
One of my favorite Nape sets. Stealth Rock and U-Turn for a lead set, ThunderPunch, and Shadow Claw for a more aggressive one. Kills SkarmBliss entirely.
Like Poke'Slash said, fix the EV's, as they are terrible. (No offense) Use 252 HP. 128 SpDef, 128 Def. Use Careful, Calm, Impish, or Bold depending on what you want.
Modest Nature. Replace Earthquake and Outrage with Surf and Dragon Pulse or Draco Meteor.
Try one of the berries that reduce one of his weaknesses, which are Fighting (Chople Berry), Ice (Yache Berry), Bug (Tango), Fairy (Roseli Berry), Grass (Rindo), or Water (Passho)
I really hope I was of help to you.