Rate my UU team

Question

Cresselia (F) @ Leftovers
Trait: Levitate
EVs: 252 Def / 4 HP / 252 Spd
Timid Nature
- Calm Mind
- Psychic
- Moonlight
- Toxic

Cofagrigus @ Sitrus Berry
Trait: Mummy
EVs: 4 SAtk / 252 HP / 252 SDef
Modest Nature
IVs: NaN Spd
- Shadow Ball
- Trick Room
- Pain Split
- Hidden Power [Fighting]

Chandelure @ Lagging Tail
Trait: Flame Body
EVs: 252 Spd / 252 SAtk / 4 SDef
Timid Nature
- Trick
- Shadow Ball
- Fire Blast
- Energy Ball

Flygon @ Expert Belt
Trait: Levitate
EVs: 252 Spd / 252 Atk / 4 SDef
Jolly Nature
- Dragon Claw
- Earthquake
- Fire Punch
- U-turn

Empoleon @ Chople Berry
Trait: Defiant
EVs: 252 Spd / 252 Def / 4 SAtk
Timid Nature
- Scald
- Stealth Rock
- Ice Beam
- Grass Knot

Froslass (F) @ Focus Sash
Trait: Cursed Body
EVs: 252 Spd / 252 SAtk / 4 SDef
Modest Nature
- Destiny Bond
- Thunderbolt
- Shadow Ball
- Ice Beam

Comments

Dark/Ghost weak. Chandelure can wreck this team, especially if it's scarfed. And it can do major damage to Empoleon.

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You have massive synergy problems as mentioned making this team death fodder for a Honchkrow.
Chandys set is messed up. Sure Lagging Tail gives the opponent -priority but is it worth wasting a turn tricking it (if you do have that turn before being ko'd). Trick is usually for Choice users as it screws over pokemon that can't use choice items such as walls and to abolish the one move rule in late game. Lagging tail is doing nothing but hindering yourself.