Could this work?

[Aguamenti]

Could this team work? I randomly thought it up right now.
(I don't have any items planned, but it doesn't matter)

Lapras
Timid Nature
EV's: Sp. Attack, Speed
-Psychic
-Thunderbolt
-Ice Beam
-Surf
Could throw in a rest somewhere too.
STRATEGY: Special Sweeper

Lanturn
Bold Nature
EV's: Sp. Attack, Def, Sp. Def
-Thunderwave
-Attract
-Aqua Ring
-Signal Beam
STRATEGY: Annoyer/Sponge?= It has high HP
Signal Beam for 30% confusion

Umbreon
Bod Nature
EV's: HP, Sp. Def, Def
-Toxic
-Mean Look
-Confuse Ray
-Assurance
STRATEGY: Annoyer/Sp. Wall; Assurance because of low speed

Togekiss
Modest Nature
EV's: Speed, Sp. Attack, remaining in Def.
-Yawn
-Aura Sphere
-Magical Leaf
-Wish
STRATEGY: Special Sweeper...sorta. AND Special wall (sorta) because of high Sp. Defense.

Donphan
Jolly Nature
EV's: Speed, Speed, and more Speed, and some Sp. Defense
-Earthquake
-Rapid Spin
-Fire Fang
-Thunder Fang
STRATEGY: Physical Sweeper/Rapid Spinner

Torkoal
Calm Nature
EV's: Defense, Sp. Defense, HP
-Flamethrower
-Iron Defense
-Amnesia
-Gyro Ball
STRATEGY: Physical Wall; Gyro ball because of low speed

Is this a good team, or will it implode in a competative match?

 

[The Shadow Trainer]

Could this team work? I randomly thought it up right now.
(I don't have any items planned, but it doesn't matter)

Lapras
Timid Nature
EV's: Sp. Attack, Speed
-Psychic
-Thunderbolt
-Ice Beam
-Surf
Could throw in a rest somewhere too.
STRATEGY: Special Sweeper

Lanturn@Leftovers
Bold Nature
EV's: Sp. Attack, Def, Sp. Def
-Thunderwave
-Attract
-Aqua Ring
-Surf/Thunderbolt
STRATEGY: Annoyer/Sponge?= It has high HP
Signal Beam for 30% confusion

Umbreon@Leftovers
Bod Nature
EV's: HP, Sp. Def, Def
-Toxic
-Mean Look/Moonlight
-Confuse Ray
-Assurance
STRATEGY: Annoyer/Sp. Wall; Assurance because of low speed

Togekiss
Modest Nature
Trait:Serene Grace
EV's: Speed, Sp. Attack, remaining in Def.
-Ancient Power/Silver Wind(20% chance with SG)
-Aura Sphere
-Flamethrower(20% chance with SG)/Shadow Ball(40% chance with SG)
-Water Pulse (40% chance witch SG)
STRATEGY: Special Sweeper...sorta. AND Special wall (sorta) because of high Sp. Defense.

Donphan@Choice Scarf
Jolly Nature
EV's: Speed, Speed, and more Speed, and some Sp. Defense Not in Attack?!?
-Earthquake
-Rapid Spin
-Fire Fang
-Thunder Fang
STRATEGY: Physical Sweeper/Rapid Spinner

Torkoal@ Leftovers
Calm Nature
EV's: Defense, Sp. Defense, HP
-Flamethrower
-Iron Defense
-Amnesia
-Gyro Ball
STRATEGY: Physical Wall; Gyro ball because of low speed

Is this a good team, or will it implode in a competative match?

So, I think this will work the best.
I also added some hold Items.