Does anyone have any suggestions to improve my UU team?

Question

Venomoth @ Black Sludge
Trait: Tinted Lens
EVs: 4 HP / 252 SAtk / 252 Spd
Timid Nature
- Quiver Dance
- Bug Buzz
- Disable
- Substitute

Hitmontop @ Leftovers
Trait: Technician
EVs: 252 HP / 252 Def / 4 SDef
Impish Nature
- Mach Punch
- Fake Out
- Sucker Punch
- Rapid Spin

Mew @ Leftovers
Trait: Synchronize
EVs: 252 HP / 4 SDef / 252 Spd
Jolly Nature
- Taunt
- Thunder Wave
- Stealth Rock
- Psyshock

Raikou @ Life Orb
Trait: Pressure
EVs: 4 HP / 252 SAtk / 252 Spd
Rash Nature
- Calm Mind
- Aura Sphere
- Thunderbolt
- Hidden Power [Ice]

Porygon2 @ Eviolite
Trait: Trace
EVs: 252 HP / 100 Def / 156 SDef
Bold Nature
- Thunderbolt
- Ice Beam
- Recover
- Toxic

Victini @ Choice Band
Trait: Victory Star
EVs: 4 HP / 252 Atk / 252 Spd
Jolly Nature
- V-Create
- Fusion Bolt
- Brick Break
- U-Turn

Comments

Weak to Scrafty.

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Just a couple of things, not too great, but help a tiny bit in general.
- Use Sleep Powder instead of Substitute or Disable.
- If Mew's keeping Psyshock, switch to a Timid Nature, which doesn't lower Special Attack.
- Victini should have 4 SDef over 4 HP to stop any Downloaders from getting a Special Attack boost.

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You have two weaknesses to ground but no resistances, so I would recommend adding a levitate pokemon. A flying type wouldn't be as good cause it would add another rock weakness.