EV and last pokemon help.

[41victory]

So heres my team.

Drifblim @ Salac Berry
Modest Nature (+Sp. Atk, -Atk)
Trait: Unburden
~ Calm Mind
~ Substitute
~ Baton Pass
~ Shadow Ball

Rampardos @ Choice Band
Adamant Nature (+Atk, -Sp. Atk)
Trait: Mold Breaker
~ Earthquake
~ Stone Edge
~ Crunch
~ Zen Headbutt

Gallade @ Life Orb
Jolly Nature (+Spd, -Sp. Atk)
Trait: Steadfast
~ Close Combat
~ Night Slash
~ Swords Dance
~ Psycho Cut

Metagross @ Expert Belt
Adamant Nature (+Atk, -Sp. Atk)
Trait: Clear Body
~ Agility
~ Meteor Mash
~ Earthquake
~ Zen Headbutt

Kingdra @ Leftovers
Bold Nature (+Def, -Atk)
Trait: Swift Swim
~ Surf
~ Ice Beam
~ Dragon Pulse
~ Yawn

I need help with EV's, a sixth pokemon, and if you like Switch items / attacks if you think it'll best suit the pokemon.

 

[MegaDitto]

Drifblim @ Salac Berry
Modest Nature (+Sp. Atk, -Atk)
Trait: Unburden
~ Calm Mind
~ Substitute/Stockpile.XD
~ Baton Pass
~ Shadow Ball

A good electric pokemon would do well. Or a wall. Luxray, perhaps?

 

[41victory]

Ok i got the last poke.
Ampharos @ ???
Nature: Quiet?
Attacks:
Thunder Bolt
Power Gem
Fire Punch
Signal Beam

So how should I Ev train?

 

[MegaDitto]

It's all up to you.

Ampharos @ Leftovers
Nature: Modest
EV; 252 HP/ 124 Sp Attack/124/ Sp Def
-Thunder Bolt
-Focus Blast
-Thunder Wave/Reflect
-Signal Beam

I'm sorry..but I'm rather klutzy.