Ambipom is terrible because while Technician Fake Outs are tempting, it's easily walled by Rock and Steel Pokemon and suffers from 4 moveslot syndrome. If you want a hard-hitting UU Normal Pokemon, use Bewear instead. Even though it's slower, its Fluffy ability gives it incredible resilience against contact moves, though you have to be careful against Fire moves:
-Return
-Hammer Arm
-Ice Punch/Shadow Claw
-Earthquake/Facade
Nature: Adamant/Jolly
EVs: 252 Atk/4 Def/252 Spe
Item: Choice Band
Ability: Fluffy
Setting entry hazards while providing Rapid Spin support to remove opposing entry hazards is one of its better niches. Your current set doesn't reflect that. The below set also has Volt Switch so Forretress can bring in a teammate unscathed given its bad Speed:
-Stealth Rock/Spikes
-Gyro Ball/Toxic
-Volt Switch
-Rapid Spin
Nature: Relaxed
EVs: 252 HP/252 Def/4 SDef
Item: Leftovers
Though Gliscor hit UU this gen, it's rather good, but here are some better alternatives for your current set: stall breaker, Stealth Rock setter, and Swords Dance:
-Earthquake
-Taunt
-Toxic
-Roost
Nature: Jolly
EVs: 244 HP/12 Def/76 SDef/176 Spe
Item: Toxic Orb
Ability: Poison Heal
or
-Swords Dance/Stealth Rock
-Earthquake
-Knock Off/Toxic/U-turn
-Roost
Nature: Jolly
EVs: 244 HP/208 SDef/56 Spe
Item: Toxic Orb
Ability: Poison
You can't use status moves while a Pokemon is equipped with Assault Vest. I'm also a bit iffy on Araquanid. You could use it in UU, but it faces a lot of competition from other Water Pokemon like Keldeo, Mega Sharpedo, Primarina, and Volcanion. While Water Bubble-powered Liquidations are incredibly powerful, Araquanid's offensive stats are average in general, meaning its coverage options are rather pathetically weak:
Keldeo:
-Hydro Pump
-Secret Sword
-Scald
-Icy Wind/Hidden Power (Electric)
Nature: Timid
EVs: 252 SAtk/4 SDef/252 Spe
Item: Choice Specs
Mega Sharpedo:
-Waterfall/Ice Fang
-Crunch
-Psychic Fangs/Ice Fang
-Protect
Nature: Jolly/Adamant
EVs: 252 Atk/4 SDef/252 Spe
Item: Sharpedonite
Ability: Speed Boost
Primarina:
-Hydro Pump
-Moonblast
-Psychic
-Scald/Energy Ball
Nature: Timid/Modest
EVs: 4 Def/252 SAtk/252 Spe
Item: Choice Specs
Volcanion:
-Fire Blast/Flamethrower
-Steam Eruption
-Hidden Power (Grass/Electric)
-Sludge Bomb/Sludge Wave/Earth Power
Nature: Timid/Modest
EVs: 4 Def/252 SAtk/252 Spe
Item: Choice Specs
or
-Fire Blast
-Steam Eruption
-Sludge Wave/Sludge Bomb
-Solar Beam/Superpower
Nature: Modest/Rash
EVs: 80 HP/252 SAtk/176 Spe
Item: Grassium Z/Fightinium Z
If you really want to use Araquanid for whatever reason, Choice Band is its best set to let it hit hard with Liquidation and at least make its coverage attacks hit harder:
-Liquidation
-Leech Life/Lunge
-Poison Jab/Return
-Sleep Talk/Return
Nature: Adamant
EVs: 248 HP/252 Atk/8 SDef
Item: Choice Band
Ability: Water Bubble
I don't think Raichu is a good Pokemon to use in UU. While its move pool gives it adequate coverage, its frailty makes it not good enough. A better special attacker to turn to is Hydreigon, which can bust through a lot of things given its huge Special Attack and wider move pool:
-Dark Pulse
-Draco Meteor
-Fire Blast
-U-turn
Nature: Timid
EVs: 252 SAtk/4 SDef/252 Spe
Item: Choice Scarf
or
-Dark Pulse
-Draco Meteor
-Fire Blast/Flash Cannon
-Roost/Flash Cannon
Nature: Timid
EVs: 252 SAtk/4 SDef/252 Spe
Item: Life Orb
or
-Dark Pulse
-Draco Meteor
-Flash Cannon
-Fire Blast/Focus Blast
Nature: Timid
EVs: 252 SAtk/4 SDef/252 Spe
Item: Choice Specs
Or you can use Gengar instead to better deal with Fairy Pokemon:
-Shadow Ball
-Sludge Wave
-Focus Blast
-Taunt/Substitute
Nature: Timid
EVs: 4 Def/252 SAtk/252 Spe
Item: Life Orb/Ghostium Z
I'd recommend Mega Aerodactyl in the last slot. While it does stack weaknesses with Gliscor, it appreciates Gliscor's stall breaking capabilities. It should only be used if you didn't opt for Mega Sharpedo:
-Stone Edge
-Wing Attack/Aqua Tail
-Earthquake/Aqua Tail
-Pursuit/Roost/Hone Claws
Nature: Jolly
EVs: 252 Atk/4 Def/252 Spe
Item: Aerodactylite
I'd also like to direct you to the
UU viability thread to see the threatening Pokemon in UU.
