[RATE MY TEAM] Rain team from newbee

[Alex]

First off this team might be a complete disaster but thats why I'm asking you guys for help. As the title says the main idea is building a rain team:

1. Politoed @ Leftovers

Timid, Drizzle

HP 252 / SpD / 252 / SpA 4

Scald
Perish Song
Helping Hand
Protect

2. Ludicolo @ Assault Vest

Bold, Swift Swim

164 HP / 140 Def / 68 SpA / 4 SpD / 132 Spe

Hydro Pump
Giga Drain
Ice Beam
Fake Out

3. Goodra @ Life Orb

Timid, Hydration

72 HP / 8 Def / 252 SpA / 176 Spe

Draco Meteor
Fire Blast
Thunder
Earthquake

4. Talonflame @ Sharp Beak

Careful, Gale Wings

HP 4 / Atk 252 / Spe 252

Brave Bird
Flare Bliz
Tailwind
U-turn

5. Aegislash @ Sitrus Berry

Quiet

252 HP / 252 SpA / 4 SpD

Wide Guard
Shadow Ball
Flash Cannon
King's Shield

6(1). Sableye @ Mega

HP 252 / Def 252 / SpA 4

Bold, Prankster

Calm Mind
Recover
Dark Pulse
Will-O-Wisp

6(2). Gengar @ Mega

Timid

4 HP / 252 SpA / 252 Spe

Taunt
Destiny Bond
Sludge Wave
Focus Blast

1. Which one for last slot (6), or even someone completely different?
2. The first three is what I consider as the core, the other ones can be swapped out...
3. Should I have one of the pokemons carry rain dance and if so who and instead of which move?