How is my Gen 4 (OU) team?

Question

Lapras (M) @ Twisted Spoon
Ability: Water Absorb
EVs: 4 HP / 252 SpA / 252 Spe
IVs: 0 Atk
- Surf
- Ice Beam
- Psychic
- Thunderbolt

Magmortar (M) @ Heat Rock
Ability: Flame Body
EVs: 4 HP / 252 SpA / 252 Spe
IVs: 0 Atk
- Flamethrower
- Thunderbolt
- Sunny Day
- Solar Beam

Electivire (M) @ Shuca Berry
Ability: Motor Drive
EVs: 4 HP / 252 Atk / 252 Spe
Lax Nature
- Thunderbolt
- Ice Punch
- Brick Break
- Earthquake

Kingdra (M) @ Razor Claw
Ability: Sniper
EVs: 4 HP / 252 SpA / 252 Spe
IVs: 0 Atk
- Surf
- Dragon Pulse
- Flash Cannon
- Focus Energy

Mamoswine (M) @ Silk Scarf
Ability: Oblivious
EVs: 4 HP / 252 Atk / 252 Spe
- Avalanche
- Earthquake
- Body Slam
- Ice Fang

Gallade @ Magnet
Ability: Steadfast
Shiny: Yes
EVs: 4 HP / 252 Atk / 252 Spe
- Brick Break
- Psycho Cut
- Thunder Punch
- Night Slash

Side note: any Pokémon with no nature has a serious nature.

Comments

Why are you using Lapras over Starmie, Suicune, Swampert, Empoleon, or Gyarados? Why Magmortar over Heatran or Infernape? Why Electivire over Zapdos or one of the Rotom forms? Why are you using that Kingdra set over Substitute + Dragon Dance or ChestoResto Dragon Dance? Why Silk Scarf Mamoswine? Why Gallade when you can use Jirachi or lead Azelf? Where is Tyranitar?

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A lot of the Pokémon here aren’t viable, and the same goes to a few sets