OU Rate my Team dilemma on walls

Question

Hi guys,
need help for my team as I am not sure which wall to use between jellicent/vaporeon/goodra/snorlax

my first choice was goodra with assault vest, but I wan your opinion.

And the others pokemon move/item/nature/ev feel free to give comment ^^

Ferrothorn @ Rocky Helmet
Ability: Iron Barbs
EVs: 252 HP / 4 Def / 252 SpD
Calm Nature
IVs: 0 Spe
- Stealth Rock
- Gyro Ball
- Protect
- Leech Seed

Tyranitar @ Choice Scarf
Ability: Sand Stream
EVs: 252 Atk / 252 Spe
Adamant Nature
- Stone Edge
- Earthquake
- Ice Punch
- Crunch

Talonflame @ Scope Lens
Ability: Gale Wings
EVs: 252 Atk / 252 Spe
Jolly Nature
- Brave Bird
- Flare Blitz
- Will-O-Wisp
- Tailwind

Aegislash @ Spooky Plate
Ability: Stance Change
EVs: 252 HP / 252 Atk / 4 Def
Adamant Nature
- Shadow Sneak
- Sacred Sword
- Swords Dance
- King's Shield

Greninja @ Life Orb
Ability: Protean
EVs: 4 HP / 252 SpA / 252 Spe
Timid Nature
- Surf
- Dark Pulse
- Ice Beam
- Grass Knot

Jellicent @ Leftovers
Ability: Water Absorb
EVs: 252 HP / 4 Def / 252 SpD
Calm Nature
- Surf
- Toxic
- Recover
- Acid Armor

dra @ Assault Vest
Ability: Hydration
EVs: 252 HP / 4 SpA / 252 SpD
Calm Nature
- Ice Beam
- Fire Blast
- Draco Meteor
- Thunderbolt

Snorlax @ Assault Vest
Ability: Thick Fat
EVs: 252 HP / 252 SpD
Calm Nature
- Body Slam
- Earthquake
- Pursuit
- Power-Up Punch

Answer 1

To solve your wall problem:
Of the choices you give, Vaporeon and Goodra run hydration. This is great if you run an entire team on rain. Your team lacks rain in every way. Out of the mons you say you want to use, I would go with your snorlax, I would like to suggest one of my favorite walls as an alternative.

Umbreon @ Leftovers
Ability: Synchronize
Brave Nature
EVs; 252 Def / 252 SDef / 4 HP

• Toxic
• Protect
• Moonlight/Wish
• Payback

Typical staller wall build. Toxic for damage, Protect to well, stall. Moonlight or wish to heal. Payback gets STAB and more power because he usually goes last