Any suggestions for my Non Gen V OU team?

Question

Mew @ Leftovers

Trait: Synchronize
EVs: 252 HP / 4 Atk / 252 Spd
Jolly Nature (+Spd, -SAtk)
- Thunder Wave
- Heal Bell
- Dragon Tail
- Roost

Gengar (M) @ Black Sludge

Trait: Levitate
EVs: 4 HP / 252 SAtk / 252 Spd
Timid Nature (+Spd, -Atk)
- Substitute
- Disable
- Shadow Ball
- Focus Blast

Salamence (F) @ Leftovers

Trait: Moxie
EVs: 4 HP / 252 Atk / 252 Spd
Jolly Nature (+Spd, -SAtk)
- Dragon Dance
- Dragon Claw
- Brick Break
- Earthquake

Infernape (F) @ Focus Sash

Trait: Iron Fist
EVs: 4 HP / 252 Atk / 252 Spd
Jolly Nature (+Spd, -SAtk)
- Swords Dance
- Mach Punch
- ThunderPunch
- Fire Punch

Rotom-W @ Choice Specs

Trait: Levitate
EVs: 180 Def / 252 SAtk / 76 SDef
Calm Nature (+SDef, -Atk)
- Trick
- Volt Switch
- Hidden Power [Ice]
- Hydro Pump

Scizor (M) @ Choice Band

Trait: Technician
EVs: 4 HP / 252 Atk / 252 Spd
Jolly Nature (+Spd, -SAtk)
- Bullet Punch
- Superpower
- Double Hit
- Bug Bite

Comments

Running 252 Speed EVs and a benefiting nature on a pokemon that uses a paralyzing move and only has one attack, which is negative priority, may not be the best idea.

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Looks Good to me :D

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Might I ask what Gengar is doing in the Team? For me, it seems it's there to be there, no other reason.