My Wanna Be Team

I've just gotten into competitive battling and I need help with my team. I can't for the life of me win a battle and i need some help. Here's the team

Skarmory - no item

Stats
All IV's are 31 and EV's are 252 HP, 234 DEF, 24 Speed

Moves

Brave Bird
Whirlwind
Roost
Spikes


Meinshow - Choice Scarf

Stats
All IV's are 31 and EV's are 6 HP, 252 Attack, and 252 Speed

Moves

Quick Guard
Hi Jump Kick
U-turn
Drain Punch

Togekiss - None

Stats
All IV's are 31 and EV's are 255 HP and 255 Speed

Moves

ExtremeSpeed
Aura Sphere
Fly
Sky Attack

Terrakion - Choice Band

All IV's are 31 and EV's are 4 HP, 244 Attack, 4 Defense, 2 SP Attack, 4 SP Defense, 252 Speed

Moves

Close Combat
Rock Slide
Earthquake
Quick Attack

Quagsire - none

Stats
31 IV all and 252 HP, 252 Defense, and 6 SP Defense

Moves

Recover
Earthquake
Scald
Toxic

Ferrothorn - Leftovers

Stats
31 IV all and 252 HP, 100 Defense, 158 SP Defense

Spikes
Toxic
Leech Seed
Power Whip

Help please

Each Pokémon must hold an item to succeed in competitive battling. Listing items and abilities would be great.

Skarmory and Ferrothorn are redundant with one another, as they play similar roles as hazard setters/walls; you have to choose between one or the other:

Skarmory:
-Spikes/Stealth Rock
-Whirlwind
-Roost
-Brave Bird
Nature: Impish/Careful
EVs: 224 HP/252 Def/32 SDef or 224 HP/32 Def/252 SDef
Item: Leftovers/Shed Shell
Ability: Sturdy

or
-Stealth Rock
-Spikes
-Taunt
-Brave Bird
Nature: Jolly
EVs: 4 HP/252 Atk/252 Spe
Item: Custap Berry
Ability: Sturdy

Ferrothorn:
-Spikes/Stealth Rock
-Leech Seed
-Power Whip
-Gyro Ball/Thunder Wave/Protect
Nature: Relaxed
EVs: 252 HP/88 Def/168 SDef
Item: Leftovers/Shed Shell

Seriously, why are you even using non-status moves besides Trick/Spore/the like on Choice sets? Choice items force you into one move until you switch and that isn't good on Mienshao. Ask yourself why you'd use it alongside Terrakion. Quick Guard is also better off on VGC teams. If you want to go with Mienshao, be my guest, but I think Garchomp is better as a Choice user:
-Hi Jump Kick
-U-turn
-Hidden Power (Ice)/Stone Edge
-Grass Knot/Stone Edge
Nature: Naive
EVs: 252 Atk/4 SAtk/252 Spe
Item: Life Orb
Ability: Regenerator

Garchomp:
-Outrage
-Earthquake
-Fire Fang/Aqua Tail
-Dragon Claw/Dual Chop
Nature: Jolly
EVs: 4 HP/252 Atk/252 Spe
Item: Choice Band/Choice Scarf

Why is Togekiss even on the team? It's better off supporting the team with flinchax. I can't think of any potential replacements, atm, but it's still better off with this:
-Thunder Wave/Body Slam
-Air Slash
-Roost
-Aura Sphere/Nasty Plot/Heal Bell
Nature: Calm
EVs: 252 HP/4 Def/252 SDef
Item: Leftovers
Ability: Serene Grace

I don't get why Quagsire is on the team at all, unless you want to check offensive setup sweepers. Otherwise, Gastrodon, Starmie and Jellicent are better options for you to use:

Gastrodon:
-Earthquake/Earth Power
-Scald/Ice Beam
-Toxic
-Recover
Nature: Sassy/Calm
EVs: 252 HP/4 Def/252 SDef
Item: Leftovers
Ability: Storm Drain

or
-Surf
-Earth Power
-Ice Beam
-Hidden Power (Grass)/Recover
Nature: Modest
EVs: 124 HP/252 SAtk/132 SDef
Item: Choice Specs/Life Orb
Ability: Storm Drain

Starmie:
-Surf/Hydro Pump
-Rapid Spin
-Psyshock/Thunderbolt
-Recover/Ice Beam
Nature: Timid
EVs: 252 SAtk/4 SDef/252 Spe
Item: Life Orb/Leftovers
Ability: Natural Cure

or
-Scald
-Rapid Spin
-Psyshock/Ice Beam/Thunderbolt
-Recover
Nature: Timid
EVs: 248 HP/32 Def/224 Spe
Item: Leftovers
Ability: Natural Cure

Jellicent:
-Scald/Surf
-Will-o-Wisp/Toxic
-Recover
-Taunt
Nature: Bold
EVs: 248 HP/216 Def/44 Spe
Item: Leftovers

or
-Scald/Surf
-Shadow Ball/Ice Beam
-Will-o-Wisp/Toxic
-Recover
Nature: Calm
EVs: 252 HP/36 Def/220 SDef
Item: Leftovers
Ability: Water Absorb

or
-Water Spout
-Hydro Pump/Surf/Scald
-Shadow Ball
-Ice Beam/Giga Drain
Nature: Modest
EVs: 172 HP/252 SAtk/84 Spe
Item: Choice Specs
Ability: Water Absorb

Thanks for the help. I will try those out. Also if anyone else has any suggestions let me know.