RMT please

[Larvitar]

Hey everyone!
I'm planning to raise a competitive team and would like your advice. I've been thinking about using the following Pokémon, but I need a 6th Pokémon. Which do you think would fit me? Which weaknesses do I have?
Any advice is welcome!

Skarmory @ Leftovers
Impish
252 HP / 216 Def / 40 Att
~ Spikes
~ Roar
~ Drill Peck
~ Roost

Salamence @ Life Orb
Modest
252 Sp.Att / 252 Spd / 4 HP
~ Dragon Pulse
~ Draco Meteor
~ Hydro Pump
~ Flamethrower

Dusknoir @ Leftovers
Impish
252 HP/252 Def/6 Sp.Def
~ Thunder Punch
~ Shadow Punch
~ Will-o-Wisp
~ Pain Split

Gallade @ Wide Lens (for Hypnosis accuracy?)
Jolly
252 Att/252 Spd/6 HP
~ Leaf Blade
~ Night Slash
~ Close Combat
~ Hypnosis

Aerodactyl @ Choice Scarf
Jolly
6 HP/252 Att/252 Spd
~ Stone Edge
~ Ice Fang
~ Earthquake
~ Pursuit

 

[MistyLover]

Good team, I must admit. Whirlwind over Roar, imo. Aerial Ace over Pursuit so you lose your Hera weakness.

 

[Larvitar]

Thanks ^_^ I'll definitely make those changes.

Also, what do you think would be a good 6th member? Maybe a Gliscor? I'm kinda blank here

 

[MistyLover]

Do you want a tank or a sweeper?

 

[Larvitar]

I think another special sweeper would match my team well. Any suggestions? Togekiss perhaps?

 

[MistyLover]

Not Togekiss, you already have another Flying Type. You could go with Lucario, Glaceon, Gardevoir with Choice Specs, Magmortar, Roserade...

 

[Larvitar]

I'll definitely go with Lucario! Thanks!

I've been thinking about this set for him: (standard, I know, but it seems to work great )

Lucario @ Choice Specs
Modest
252 Sp.Att / 252 Spd / 4 Def
~ Dragon Pulse
~ Aura Sphere
~ Psychic
~ Dark Pulse

Would it work with the rest of my team?