I'm going to a tournament next week, and I was wondering what I could do to make this team better:

Dragonite @ Weakness Policy
Ability: Multiscale
EVs: 252 Atk / 4 SDef / 252 Spd
Adamant Nature
IVs: 30 Atk
- Outrage
- Dragon Dance
- Fire Punch
- Roost

Lanturn @ Leftovers
Ability: Water Absorb
EVs: 40 HP / 252 Def / 216 SDef
Calm Nature
- Surf
- Blizzard
- Confuse Ray
- Thunder Wave

J.A.K.Q (Bisharp) (M) @ Leftovers
Ability: Defiant
Shiny: Yes
EVs: 124 HP / 252 Atk / 132 SDef
Adamant Nature
- Iron Head
- Swords Dance
- Sucker Punch
- Substitute

Banette (F) @ Banettite
Ability: Cursed Body
EVs: 252 HP / 252 Def / 4 SDef
Adamant Nature
- Shadow Sneak
- Taunt
- Will-O-Wisp
- Knock Off

Sirknight (Gardevoir) @ Leftovers
Ability: Trace
EVs: 252 HP / 120 SAtk / 136 SDef
Modest Nature
- Psyshock
- Wish
- Moonblast
- Protect

Gliscor @ Toxic Orb
Ability: Poison Heal
EVs: 244 HP / 248 Atk / 16 Spd
Impish Nature
- Earthquake
- Toxic
- U-turn
- Protect