Okay, is this a rain team? I don't see any drizzlers...
Okay, then let's add one!
Swap out Kingler for:
Politoed @ Damp Rock
EVs: 252 Attack, 104 HP, 152 Sp. Defense
Hypnosis
Focus Punch
Belly Drum
Waterfall
Starmie need improvement:
EVs: 252 Speed, 252 Sp.Attack, 4HP
Replace Hydro Pump with Surf
Give it the Wise Glasses
Try to get Brave on Carracosta, if you can't it's okay.
EVs: 252 Defense, 252 Attack, 4 HP
Earthquake
Curse
Aqua Tail
Stone Edge
Jellicent: Leftovers
EVs: 252 Sp. Defense, 104 Hp, 156 Sp. Attack
Confuse Ray
Surf
Toxic
Psychic
Kingdra: Life Orb
Surf
Dragon Pulse
Signal Beam
Ice Beam
Whiscash @ Focus Sash
Trait: Hydration
EVs: 40 HP / 252 Atk / 216 Spd
Jolly Nature (+Spd, -SAtk)
Dragon Dance
Waterfall
Earthquake
Stone Edge