Be aware that I am new to EVs, but I do understand how to gain them and how they work
Changes in Bold
Jolteon @ Choice Specs
Timid
Volt Absorb
Def 4 / SpA 252 / Spe 252
Thunderbolt
Signal Beam/Roar
Shadow Ball
Baton Pass
Not a common lead for a team, It is mainly up against common leads at first, such as Metagross, Swampert, and the occasional Bronzong. Fearing an EQ from those Pokemon, I quickly use a Baton Pass to avoid it and switch into Gengar or Salamence. I can't decide over Signal Beam or Roar, I couldn't make it a HP Grass
Gengar @ Choice Scarf
Timid
Levitate
Def 4 / SpA 252 / Spe 252
Shadow Ball
Thunderbolt
Focus Blast
Explosion
This guy is amazing against the common leads like Metagross when brought out by Baton Pass. It's immune to both EQ and Explosion, which is abused on Metagross. It can handle many types, and when it's up against a tough threat, all I need to do is explode to deal massive damage
Scizor @ Life Orb
Adamant
Technician
HP 32 / Atk 252 / Spe 224
Swords Dance
Bullet Punch
Brick Break
X-Scissor
Great speed and great attack, As soon as he is sent out, I use a Swords Dance and get his Atk stat high, then the rest depends on the opponent.
I use Brick Break over Superpower because although I could just use another Swords Dance, I don't really enjoy lowering my stats.
Dugtrio @ Choice Band
Jolly
Arena Trap
HP 40 / Atk 252 / 216
Earthquake
Stone Edge
Sucker Punch
Aerial Ace
My main Ground type and revenge killer. It can quickly take out pokemon with low Def stats. Night Slash is used for the critical hit bonus to hurt Psychics and Ghosts.
Starmie @ Leftovers
Timid
Natural Cure
HP 136 / Def 156 / Spe 216
Rapid Spin
Surf
Thunderbolt
Recover
Starmie is used to get rid of Stealth Rocks and spikes that my opponent set up. I use Psychic over Thunderbolt because Psychic has a STAB, same as Surf. Recover allows Starmie to stay in battle for a few turns and deal some damage.
Salamence @ Life Orb
Naughty
Intimidate
Atk 232 / SpA 24 / Spe 252
Dragon Dance
Outrage
Earthquake
Flamethrower
Salamence can quickly raise both it's Atk stat and Spe stat, allowing EQ and Outrage to deal more damage. Very rarely, would I switch into Salamence from a Baton Pass, because I fear Explosion will KO Salamence. Flamethrower is used over Fire Blast because it has better accuracy.
If you ask me, I see no problems with this team. However, I'm not an expert. So if you see any problems with this team, tell me what you mean, and how it can help
Changes in Bold

Jolteon @ Choice Specs
Timid
Volt Absorb
Def 4 / SpA 252 / Spe 252
Thunderbolt
Signal Beam/Roar
Shadow Ball
Baton Pass
Not a common lead for a team, It is mainly up against common leads at first, such as Metagross, Swampert, and the occasional Bronzong. Fearing an EQ from those Pokemon, I quickly use a Baton Pass to avoid it and switch into Gengar or Salamence. I can't decide over Signal Beam or Roar, I couldn't make it a HP Grass

Gengar @ Choice Scarf
Timid
Levitate
Def 4 / SpA 252 / Spe 252
Shadow Ball
Thunderbolt
Focus Blast
Explosion
This guy is amazing against the common leads like Metagross when brought out by Baton Pass. It's immune to both EQ and Explosion, which is abused on Metagross. It can handle many types, and when it's up against a tough threat, all I need to do is explode to deal massive damage

Scizor @ Life Orb
Adamant
Technician
HP 32 / Atk 252 / Spe 224
Swords Dance
Bullet Punch
Brick Break
X-Scissor
Great speed and great attack, As soon as he is sent out, I use a Swords Dance and get his Atk stat high, then the rest depends on the opponent.
I use Brick Break over Superpower because although I could just use another Swords Dance, I don't really enjoy lowering my stats.

Dugtrio @ Choice Band
Jolly
Arena Trap
HP 40 / Atk 252 / 216
Earthquake
Stone Edge
Sucker Punch
Aerial Ace
My main Ground type and revenge killer. It can quickly take out pokemon with low Def stats. Night Slash is used for the critical hit bonus to hurt Psychics and Ghosts.

Starmie @ Leftovers
Timid
Natural Cure
HP 136 / Def 156 / Spe 216
Rapid Spin
Surf
Thunderbolt
Recover
Starmie is used to get rid of Stealth Rocks and spikes that my opponent set up. I use Psychic over Thunderbolt because Psychic has a STAB, same as Surf. Recover allows Starmie to stay in battle for a few turns and deal some damage.

Salamence @ Life Orb
Naughty
Intimidate
Atk 232 / SpA 24 / Spe 252
Dragon Dance
Outrage
Earthquake
Flamethrower
Salamence can quickly raise both it's Atk stat and Spe stat, allowing EQ and Outrage to deal more damage. Very rarely, would I switch into Salamence from a Baton Pass, because I fear Explosion will KO Salamence. Flamethrower is used over Fire Blast because it has better accuracy.
If you ask me, I see no problems with this team. However, I'm not an expert. So if you see any problems with this team, tell me what you mean, and how it can help