OU Team Suggestion ( last choices for special wall)

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
Relaxed Nature
IVs: 0 Spe
- Stealth Rock / Spikes
- Gyro Ball / Power Whip
- Protect
- Leech Seed

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

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

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

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

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

goodra @ 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


-- UPDATED --

Thinking of adding a Florges in my team although it belongs to the UU tier.
with this move set :
Calm ( HP / Def)
Moonblast,
Wish
Protect
Aromatherapy

A Calm nature is bad for Ferrothron, as it's a physical attacker. As a mono-attacking move, Power Whip is preferred because of its higher PP than Gyro Ball. Ferrothorn's EV spread below gives it good mixed bulk, letting it take physical and special hits comfortably:
-Stealth Rock
-Leech Seed
-Power Whip
-Gyro Ball/Protect/Knock Off
Nature: Relaxed
EVs: 252 HP/88 Def/168 SDef
Item: Leftovers
Ability: Iron Barbs

Jolly > Adamant on Scarf Tyranitar, as with Adamant, it fails to outspeed Garchomp and those faster than it, even with Choice Scarf. Pursuit is preferred over Ice Punch because of the utility of catching opponents as they switch.

Why would you use Scope Lens on Talonflame? It doesn't have any high critical hit ratio moves to abuse with said item. Adamant is also the preferred nature for it, as Gale Wings gives Brave Bird priority, making the extra Speed from Jolly unnecessary. Talonflame also isn't very strong, so it needs all the power it can get:
-Swords Dance
-Flare Blitz
-Brave Bird
-Roost/Natural Gift
Nature: Adamant
EVs: 252 Atk/4 Def/252 Spe
Item: Life Orb/Sharp Beak/Sky Plate/Liechi Berry/Salac Berry
Ability: Gale Wings

or
-Flare Blitz
-Brave Bird
-U-turn
-Roost/Tailwind
Nature: Adamant
EVs: 252 Atk/4 Def/252 Spe
Item: Sharp Beak/Sky Plate/Choice Band
Ability: Gale Wings

or
-Bulk Up
-Brave Bird
-Roost
-Taunt/Will-o-Wisp
Nature: Careful
EVs: 248 HP/8 Def/252 SDef
Item: Leftovers
Ability: Gale Wings

Swords Dance + King's Shield Aegislash is tempting at first glance, but it's terrible. It's shut down by burn easily and very easy to wall. Aegislash is better off going mixed, special or without King's Shield if it uses Swords Dance:
-Shadow Ball
-Shadow Sneak/Iron Head
-Sacred Sword/Iron Head/Pursuit
-King's Shield
Nature: Quiet
EVs: 244 HP/12 Def/252 SAtk
Item: Leftovers/Spooky Plate/Spell Tag/Air Balloon

or
-Substitute
-Toxic
-Shadow Ball
-King's Shield
Nature: Modest
EVs: 244 HP/12 Def/252 SAtk
Item: Leftovers

or
-Shadow Ball
-Shadow Sneak
-Flash Cannon/Pursuit
-Sacred Sword
Nature: Hasty/Naive
EVs: 4 Atk/252 SAtk/252 Spe
Item: Life Orb

or
-Swords Dance
-Shadow Sneak
-Shadow Claw/Iron Head
-Sacred Sword/Head Smash
Nature: Adamant
EVs: 252 Atk/4 SDef/252 Spe
Item: Life Orb

Greninja needs Extrasensory so that it can deal with Mega Venusaur (Thick Fat makes Ice Beam a neutral move on it). Hydro Pump > Surf for the extra power; Greninja needs all the power it can get:
-Hydro Pump
-Ice Beam
-Extrasensory
-Dark Pulse/Hidden Power (Grass/Fire)/Grass Knot/Spikes
Nature: Timid
EVs: 4 HP/252 SAtk/252 Spe
Item: Life Orb
Ability: Protean

Jellicent is terrible now because Knock Off is omnipresent. Its spin blocking role has been diminished, since there's an alternative hazard-clearing move in Defog. Rapid Spin/Defog support is needed, as Talonflame is weak to Stealth Rock. Mandibuzz, Zapdos and Mega Scizor are bulky Defog users to fall back on:

Mandibuzz:
-Foul Play
-Roost
-Taunt/Whirlwind
-Defog
Nature: Bold
EVs: 248 HP/136 Def/108 SDef/16 Spe
Item: Leftovers
Ability: Overcoat

Zapdos:
-Thunderbolt
-Roost
-Defog
-Heat Wave/Toxic/U-turn
Nature: Bold
EVs: 248 HP/168 Def/68 SAtk/20 Spe
Item: Leftovers

Mega Scizor:
-Bullet Punch
-U-turn/Superpower/Knock Off
-Defog
-Roost
Nature: Impish
EVs: 248 HP/252 Def/8 SDef
Item: Scizorite
Ability: Technician

Goodra is rather meh, but it could work. However, there are better moves to be used:
-Draco Meteor
-Fire Blast
-Thunderbolt/Sludge Bomb
-Dragon Tail
Nature: Quiet/Modest
EVs: 248 HP/252 SAtk/8 SDef
Item: Assault Vest
Ability: Gooey/Sap Sipper

Conkeldurr is one of the best Assault Vest users because of its access to semi-reliable recovery in Drain Punch:
-Drain Punch
-Mach Punch
-Knock Off
-Ice Punch/Stone Edge
Nature: Adamant
EVs: 252 Atk/236 SDef/20 Spe
Item: Assault Vest
Ability: Guts

If you specifically wanted a special wall on the team, use Mega Venusaur:
-Giga Drain
-Sludge Bomb
-Leech Seed/Sleep Powder/Hidden Power (Fire)/Earthquake/Knock Off
-Synthesis
Nature: Calm/Sassy
EVs: 252 HP/240 SDef/16 Spe
Item: Venusaurite

yo thanks for the detailed suggestion.. will check whether which one fits me

if you're on the defensive, play on pivoted switches if youre playing offense/balance. not on stats.

you play the mons on their resistances/immunities while on the defensive, which also often gives you your momentum back, instead of just having a blissey sitting there doing nothing.

unless you play stall. then the point is just to sit there.

yo I had edited my post and some of the pokemon.