Wi-Fi Team Help?

[Sheraseo]

I've started playing competitively on Pokemon Black and i was wondering how this team sounds so far and any improvements people would make to make this team better.

Swampert - Water + Ground - Overall Stats: 535
Earthquake + Hydro Pump
Rock Slide + Ice Beam

Volcarona - Bug + Fire - Overall Stats: 550
Quiver Dance + Bug Buzz
Flamethrower + Psychic

Metagross - Steel + Psychic - Overall Stats: 600
Hammer Arm + Zen Headbutt
Ice Punch + Meteor mash

Zapdos - Electric + Flying - Overall Stats: 580
U-Turn + Thunderbolt
Heat Wave + Aerial Ace

Hydreigon - Dark + Dragon - Overall Stats: 600
Dark Pulse + Draco Meteor
Fire Blast + Stone Edge

Gengar - Ghost + Poison - Overall Stats: 500
Giga Drain + Shadow Ball
Thunderbolt + Brick Break

I'm not so good with structure and any comments or improvements would be much appreciated

 

[PlatinumDude]

EVs and natures would totally be useful here.

Regarding movesets:

Swampert is generally seen as a bulky supporter or attacker:
-Stealth Rock
-Earthquake
-Ice Beam
-Scald/Roar/Superpower/Protect
Nature: Relaxed
EVs: 240 HP/252 Def/16 SDef
Item: Leftovers

or
-Waterfall
-Earthquake
-Superpower
-Stone Edge/Ice Punch
Nature: Adamant
EVs: 172 HP/252 Atk/84 Spe
Item: Choice Band

Volcarona is better off with Fire Blast or Fiery Dance as its Fire STAB; Fire Blast has more power (but less accuracy), and Fiery Dance has a 50/50 chance to boost Special Attack.

Metagross certainly has the stats to be a late-game Agility sweeper:
-Agility
-Meteor Mash
-Earthquake
-Zen Headbutt/Ice Punch/ThunderPunch
Nature: Jolly/Adamant
EVs: 52 HP/252 Atk/204 Spe
Item: Life Orb/Air Balloon/Lum Berry

Metagross also has enough bulk to run a support set or a bulky attacking set:
-Stealth Rock
-Meteor Mash
-Bullet Punch
-Hammer Arm
Nature: Adamant
EVs: 252 HP/252 Atk/4 Spe
Item: Leftovers/Air Balloon/Occa Berry

or
-Meteor Mash
-Hammer Arm
-Bullet Punch
-Zen Headbutt/Trick/Pursuit
Nature: Adamant
EVs: 252 HP/252 Atk/4 Def
Item: Choice Band

or
-Meteor Mash
-Grass Knot/Psychic
-Hidden Power (Fire)
-Ice Punch
Nature: Brave
EVs: 252 Atk/148 SAtk/108 Spe
Item: Expert Belt/Life Orb

Aerial Ace may seem tempting as a secondary STAB, but it's not viable because it has low BP and it also runs off of Zapdos' weaker offensive stat. Zapdos can easily get away with just Thunderbolt as its STAB move. It can also pull off defensive sets quite well, despite having offensively leaning stats:
-Substitute
-Roost
-Thunderbolt
-Toxic/Heat Wave/Hidden Power (Ice)
Nature: Timid
EVs: 192 HP/64 Def/252 Spe
Item: Leftovers

or
-Thunderbolt
-Heat Wave
-Hidden Power (Ice/Grass)
-Roost
Nature: Modest/Timid
EVs: 4 HP/252 SAtk/252 Spe
Item: Life Orb/Expert Belt

or
-Thunderbolt
-Heat Wave/Hidden Power (Ice)
-Roost
-Thunder Wave/Roar
Nature: Bold
EVs: 248 HP/228 Def/8 SDef/24 Spe
Item: Leftovers

While Hydreigon has the stats to go mixed, Stone Edge isn't the best option for a physical move:
-Draco Meteor
-Fire Blast
-Superpower
-Roost/Earthquake/Dark Pulse
Nature: Rash/Mild
EVs: 4 HP/252 SAtk/252 Spe
Item: Leftovers/Life Orb/Expert Belt
(Superpower and Roost are accessible only in B2/W2)

or
-Substitute
-Dragon Pulse
-Focus Blast
-Fire Blast/Roost
Nature: Modest
EVs: 4 HP/252 SAtk/252 Spe
Item: Leftovers

or
-Draco Meteor
-Focus Blast
-Fire Blast/Flamethrower
-U-turn/Dark Pulse
Nature: Modest
EVs: 4 HP/252 SAtk/252 Spe
Item: Choice Specs/Choice Scarf

Gengar can easily get away with just Shadow Ball and Focus Blast as its sole offensive moves because Ghost + Fighting have perfect coverage together. Don't bother with Brick Break; it uses Gengar's weaker offensive stat:
-Substitute
-Shadow Ball
-Focus Blast
-Disable/Pain Split/Thunderbolt/Hidden Power (Fire)
Nature: Timid
EVs: 4 HP/252 SAtk/252 Spe
Item: Black Sludge/Life Orb

 

[Sheraseo]

I'm still having second thoughts about Zapdos and whether to swap him for another electric type Pokemon, i'm trying to basically cover as many elements as i can.