Water Type Team

Hi. I'm participating in a tournament in which you choose one type, and form a team of Pokemon that type. Here's what I've got.
Special Wall-Kingdra
-Brine
-Hydro Pump
-Ice Beam
-Dragon Pulse
EV:
52 HP
252 Def
204 SDef

Cleric-Vaporeon
-Rain Dance
-Muddy Water
-Hidden Power/Hydro Pump? (can't decide)
-Ice Beam
EV:
100 HP
252 SAtk
152 Spd

Special Wall-Walrein
Item:
Ice Beam
Blizzard
Aqua Ring
Toxic
20 HP
236 SpA
252 SpD

Special Sweeper-Lapras
Item: Leftovers
- Thunderbolt
-Waterfall
-Return
-Ice Shard
EV:
20 HP
252 Atk
236 Spd

Physical Wall-Carracosta
Item: Chesto Berry
-Aqua Jet
-Ancient Power
-Ice Beam
-Rest
EV:
200 HP
52 Atk
252 Def

Thoughts? Also, I could use a physical sweeper. Any suggestions?

give the walrein the leftovers and teach it protect. if you need a physical sweeper then i would guess feraligatr, i have one bred for competition if you want it, VM me.
you might want to replace some moves on lapras, waterfall is a physical move meaning it won't do much for a special lapras, try surf instead. try to fill in these gaps in the movesets with status moves or protect. i know some of the water starters learn earthquake, the only one off the top of my head is blastoise but i'll check pokedex 3D pro and get back to you on that

This team needs plenty of work.

Kingdra doesn't make a good special wall because while it has the same base defenses as Bouffalant, it has lower base HP that undermines them. It's better off with an offensive set:
-Rain Dance
-Hydro Pump/Surf
-Draco Meteor
-Dragon Pulse/Surf
Nature: Modest
EVs: 40 HP/252 SAtk/216 Spe
Item: Life Orb/Damp Rock
Ability: Swift Swim

or
-Draco Meteor
-Hydro Pump
-Dragon Pulse/Ice Beam
-Surf/Ice Beam
Nature: Modest/Timid
EVs: 28 HP/252 SAtk/228 Spe
Item: Choice Specs
Ability: Swift Swim

or
-Substitute
-Dragon Dance
-Waterfall
-Outrage
Nature: Adamant
EVs: 40 HP/228 Atk/12 Def/228 Spe
Item: Leftovers
Ability: Swift Swim

or
-Dragon Dance
-Waterfall
-Outrage
-Rest
Nature: Adamant
EVs: 152 HP/96 Atk/32 SDef/228 Spe
Item: Chesto Berry
Ability: Swift Swim

or
-Dragon Dance
-Outrage
-Waterfall/Hydro Pump
-Hidden Power (Fire)/Draco Meteor
Nature: Lonely/Naughty
EVs: 136 Atk/136 SAtk/236 Spe
Item: Life Orb
Ability: Swift Swim

You call Vaporeon a cleric and it doesn't have Heal Bell? It can provide Wish support, considering its massive base HP:
-Wish
-Protect
-Scald
-Toxic/Ice Beam
Nature: Bold
EVs: 248 HP/252 Def/8 Spe
Item: Leftovers
Ability: Water Absorb

Gastrodon is a better special wall than Walrein (because the latter's defensive typing sucks). It also checks opposing Water Pokémon nicely:
-Earthquake/Earth Power
-Scald/Ice Beam
-Toxic
-Recover
Nature: Sassy/Calm
EVs: 252 HP/4 SAtk/252 SDef
Item: Leftovers
Ability: Storm Drain

Starmie and Rotom-W are both stronger and faster than Lapras when it comes to special sweeping. And why are you calling Lapras a special sweeper when it has mostly physical moves?:

Starmie:
-Hydro Pump/Surf
-Ice Beam
-Thunderbolt
-Rapid Spin/Recover
Nature: Timid
EVs: 252 SAtk/4 SDef/252 Spe
Item: Life Orb/Leftovers/Expert Belt
Ability: Natural Cure

or
-Hydro Pump/Surf
-Ice Beam
-Thunderbolt
-Psyshock/Trick
Nature: Timid
EVs: 4 HP/252 SAtk/252 Spe
Item: Choice Specs/Choice Scarf
Ability: Natural Cure

Rotom-W:
-Volt Switch
-Hydro Pump
-Will-o-Wisp
-Pain Split/Hidden Power (Ice)
Nature: Modest
EVs: 184 HP/4 Def/144 SAtk1/176 Spe
Item: Leftovers

or
-Volt Switch
-Hydro Pump
-Will-o-Wisp/Thunder Wave
-Pain Split
Nature: Calm
EVs: 248 HP/28 SAtk/228 SDef
Item: Leftovers

or
-Volt Switch
-Hydro Pump
-Hidden Power (Ice)
-Trick/Thunderbolt
Nature: Timid
EVs: 4 HP/252 SAtk/252 Spe
Item: Choice Specs/Choice Scarf

Carracosta's defensive typing is bad. Really bad. Slowbro makes a better physical wall:
-Scald
-Psyshock/Psychic
-Thunder Wave/Toxic/Ice Beam
-Slack Off
Nature: Bold
EVs: 248 HP/244 Def/16 SAtk
Item: Leftovers
Ability: Regenerator

or
-Calm Mind
-Scald
-Psyshock
-Slack Off
Nature: Bold
EVs: 248 HP/244 Def/16 SAtk
Item: Leftovers
Ability: Regenerator

Or you can try Cloyster as a physical attacker, as this team is massively weak to special walls like Blissey:
-Shell Smash
-Icicle Spear
-Rock Blast
-Hydro Pump/Razor Shell
Nature: Naive/Jolly
EVs: 252 Atk/4 SAtk/252 Spe
Item: White Herb
Ability: Skill Link