Jennifer R Asked: How bad is this Pokemon team?

OK, so I've been playing Pokemon for a while, (by "playing" I mean beating the Elite Four, catching all the legionaries and beating people until I have some cool high level Pokemon) but I never really tried to make a good team for battling other people. I play a lot of strategyish games, and I'll have a lot of time this Summer, so I decided to try and put one together. I'll mostly be battling friends (the kind who don't really know what they're doing but have 6 sweepers like Dragonite, Scizor, etc. Sometimes even Kyogre.) but if I enjoy it enough maybe I'll battle people over wifi. I know how EV training and natures work, but any tips on how to do it faster would be great.

What I'd really like from you guys is just a few tips. I like these Pokemon, and I'm aware I have too many water Types. I just want to hear some items I may have overlooked, or commonly used Pokemon I'm very weak against and should make a few tweaks to accommodate for, and maybe if absolutely necessary 1-2 Pokemon I need to switch. I don't need this to be optimal, just fun and not a (total) waste of time.
Oh, also I'd like the team to be legal in the sense that nobody would consider it really cheap. Idk what the rules are like for competitive pokemon sans no ubers, so yeah.
I know I'm being kind of picky and you guys are taking time out of your day to help me out, so finally, I'd like to say thanks for reading! The teams below and if you help me out I'll do best to help you out any way I can.

Kingdra:
Rain Dance
Blizzard
Dragon Pulse
Surf

SP D, HP
+SP D ATTK

SWIFT SWIM
Damp Rock

Kabutops:
Rain Dance
Swords Dance
Waterfall
Stone Edge
+ATTK , +DEF/SPD
+ATTK SP A
SWIFT SWIM
Focus Sash

Starmie:
Surf
Rapid Spin
Ice beam
Psychic

SP A, SPD
+SPD ATTCK
NATURAL CURE
Life Orb

Tangrowth:
Leech Seed
Power Whip
Earthquake
Protect

+DEF, +HP
+Def, -SP A

REGENERATOR
LEFTOVERS
Jolteon:
Thunder
Thunder Wave
Volt Switch
Heal bell

+SP ATKK + SPD
+ SPD ATTK

VOLT ABSORB
Air balloon

Ludicolo:
Surf
Giga Drain
Rain Dance
Counter
+SP A + SP DEF
+SP A – ATTK

RAIN DISH
Big root