Azumarill needs enough Speed EVs to outspeed Pokemon up to minimum base Speed 70s, like defensive Politoed. If you want to go faster, 92 Speed EVs outspeeds Aegislash, while 124 lets Azumarill outspeed regular Scizor.
Wobbuffet's EVs need re-doing, since Counter and Mirror Coat base their damage on how much damage Wobbuffet took. Use 28 HP/252 Def/228 SDef with a Bold/Calm nature for optimal bulk.
You can consider Choice Band Scizor to act as part of a Volt-turn core alongside Mega Manectric:
-U-turn
-Bullet Punch
-Superpower/Brick Break
-Pursuit/Knock Off
Nature: Adamant
EVs: 248 HP/252 Atk/8 SDef
Item: Choice Band
Ability: Technician
The only thing that benefits from Scolipede's Swords Dance is Azumarill, but the boosts will be wiped away when it's forced to switch out. A Timid nature is useless if Scolipede runs a physical offensive move. I'd recommend having Scolipede as a late-game cleaner or a hazard lead, since your current Scolipede set appears geared towards dedicated Baton Pass teams:
-Megahorn
-Spikes
-Swords Dance
-Baton Pass/Earthquake/Rock Slide
Nature: Jolly
EVs: 252 Atk/4 Def/252 Spe
Item: Focus Sash
Ability: Speed Boost
or
-Megahorn
-Poison Jab/Rock Slide
-Earthquake
-Protect
Nature: Adamant
EVs: 252 Atk/4 Def/252 Spe
Item: Life Orb
Ability: Speed Boost
Edit: if you have a hard time with Prankster users, a Pokemon with a sound move or a multi-hit move can strike past the Substitute. Mega Gardevoir or Mega Heracross can do that for you, though this means replacing Manectric:
Gardevoir:
-Psyshock
-Hyper Voice
-Focus Blast
-Shadow Ball/Will-o-Wisp/Taunt
Nature: Timid
EVs: 24 Def/232 SAtk/252 Spe
Item: Gardevoirite
Ability: Trace
or
-Calm Mind
-Psyshock
-Hyper Voice
-Shadow Ball/Taunt
Nature: Timid
EVs: 24 Def/232 SAtk/252 Spe
Item: Gardevoirite
Ability: Trace
Mega Heracross:
-Pin Missile
-Close Combat
-Rock Blast
-Earthquake/Swords Dance
Nature: Adamant
EVs: 40 HP/252 Atk/216 Spe
Item: Heracronite
Ability: Guts/Moxie
Don't forget Talonflame, which naturally outspeeds 0 Speed Whimsicott, meaning its priority-induced Brave Birds will go before the Sub:
-Swords Dance
-Flare Blitz
-Brave Bird
-Roost
Nature: Adamant
EVs: 252 Atk/4 Def/252 Spe
Item: Life Orb/Sharp Beak/Sky Plate
Ability: Gale Wings
or
-Flare Blitz
-Brave Bird
-U-turn
-Tailwind/Roost
Nature: Adamant
EVs: 252 Atk/4 Def/252 Spe
Item: Choice Band/Sharp Beak/Sky Plate
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