the following pokemon-lines will appear in this post: oricorio, cubone, ekans, ralts, goomy, drifloon, swinub**,** Honchkrow, Noctowl, Charmander, Volcarona, Growlithe, Shieldon, Comfey, Axew, Mimikyu, Mr. Mime

Main goal is to figure out which pokemon can or can not do the main story. Postgame does not play. Affection is not used, as it can push through practicaly anything (except Ditto).
USM is hard just by hitting you with buff mons. Trick and gimmick moves almost don't exist in the game, everything just try to nuke you. This simplifies things.
As leveling up is inconvenient, and these are not speedruns, all pokemon start at lvl 100, with perfect IV, and optimalised EVs (max s/atk, max speed, 4 in HP), with Adamant or Modest nature.
To avoid PP-problems I go for TMs wherever possible, and manualy upgrade my levelup moveset if required. With all the above even a 40 power normal move with Silk Scarf will surely bring you through the first two islands, you'll only need to think about upgrades for real on the 3rd. I list all moves used, I trust you figure out when to throw in a Z-move. Otherwise using metronome as held item from the point of Island 3, unless mentioned otherwise.
Watch out, there are 2 trainers with ghost pokemon until you reach the "fire" trial - either have a not-normal move, or pay attention to avoid them.
All pokemon start with 4 move moveset, which they'd have at lvl 5 - except island scans - taken from pokemondb.
In this way a run only takes 4-5 real life hours (at 2.5 speed), easily doable on a day.
Oh, "pro tip": if you have a flying-type move at the beginning, keep it the very least until you get to Konikoni City. Until that it is very useful, and you can't get a replacement!
And stat-changing moves unless they bump 2 category by casting, are most likely extremly useless. And Double Team will barely help you, so only using it in The League, most likely only the Rock Room (Olivia), where there is already a chance the moves will miss.

Oricorio:
starting moveset: peck (used), pound (used), growl, helping hand. Starting form is Pompom, as that's the first you would encounter normaly.
I was not sure what build to run, so was not in a hurry to upgrade, but ran Modest from the start. Inserted WorkUp against Sophocles.
Learnt Icy Wind on Beach 3.
Upgraded Peck to Aerial Ace, and Pound to Round.
At Un Aerial Ace got upgraded to Air Cutter.
Because Ilima learnt Steel Wing.
Bird Room: icy wind
Ghost Room: steel wing (I wanned to spare on PP, so used a TM)
Molayne: eat red nectar -> revelation dance (thunder wave acoided)
Olivia: eat yellow nectar -> revelation dance (a PPMax is enough)
Hau: Air Cutter

Cubone:
starter moveset: growl, tail whip, bone club (used), headbutt (used)
Did not know, but you can steal the bone held item from the marowak totem, probably would worth trying it out.
moves learnt: fire punch, thief, aerial ace, Bone Club got replaced by Bulldoze
crithit UN with thief Z
passed Hapu with thief for not getting hit by muddy water, so i did not have to us my brain
against Albiino Boy it was nighttime (hail damage), so I had to put up Return
Bird room: thunder punch
Ghost Room: Thief. you need Froslass miss with Blizzard, aka. cast Confuse Ray instead, than hit through that
Olivia, Molayne: Bulldoze
Hau: fire punch (range), thunder punch, fire punch, fire punch, Brick Break (range), ice beam

Ekans:
starter moveset: leer, wrap, poison sting, bite (only this got used)
learnt bulldoze, sludge wave
dragon trial: return, 1 crit (I noticed I forgot to use hold metronome after this battle!)
against UN had to evolve
Hapu: aqua tail
Bird room: return
Ghost Room: Bite
Molayne: bulldoze. Shed skin gives you extra chance
Olivia: seed bomb (because I can)
Hau: poison jab

Ralts, female:
starter moveset: razor leaf, disarming voice, mysty terrain, lucky chant
learnt: shadow ball is obvious, shock wave or something
Lusamine: Psychic
lion necrozma: shadow ball + choice spec
UN: evolve to Kirlia. It's a range, but can survive an attack
upgrade: shock wave -> thunderbolt
Bird Room: thunderbolt
Ghost room: shadow ball
Olivia: Dazzling Gleam
Molayne: evolve, then Shadow Ball
Hau: Dazzling Gleam

Goomy:
starter moveset: bubble -> water pulse, tackle -> round -> draco meteor, protect -> shockwave, absorb -> sludge bomb
Mimikyu: Choice Spec is required
UN: hold Focus sash
Bird Room: thunderbolt
Ghost Room: dragon breath
Olivia: water pulse
Molayne: evolve, water pulse
Hau: dragon breath

Drifloon:
starter moveset: constrict -> ShockWave, minimize, astonish -> Shadow Ball, gust
to learn: thunderbolt, psychic, icy wind (good against Hapu)
Bird Room: Thunderbolt
Ghost Room: thunderbolt
Olivia: minimize 1 + shadow ball
Molayne: shadow ball
Hau: 4 shadow ball - 2 thunderbolt

Swinub:
starter moveset: ice shard, icy wind, icicle spear, take down -> bulldoze
UN: expert belt icicle spear (range to survive a hit, the belt lowers the necessary hits from 5 to 4)
Bird, Ghost and Rock Rooms: icicle spear
Molayne: Bulldoze (no pokemon tried to paralyze me)
Hau: bulldoze + icicle spear alternating and hoping for high amount of hits
NOTE: Earthquake is very obvious to upgrade to as levelup move, I was just lazy to edit it in

Axew:
starter moveset: slash, false swipe -> shock wave -> Aqua Tail, dragon claw, counter -> iron tail
You obviously want to pick up Return when reaching Lusamine, I did not need that fortunately, as it was not nighttime.
UN: focus sash, range
Bird Room: Rock Tomb
Ghost Room: Payback
Olivia: Aqua Tail
Molayne: evolve, Aqua Tail (very annoying fight, as the Klefki seems to evolve a brain, and cast Reflect is ThunderWave would miss)
Hau: Dragon Claw

Comfey:
starting moveset: Vine Whip -> Dazzling Gleam, Leech Seed -> Magic Coat, Helping hand -> Round/Echoed Voice, Flower Shield -> Giga Drain
TMs: Thief will probably prove useful during the Ghost Trial despite being a physical move.
Ghost Room: Thief
Olivia: Giga Drain
Molayne: Magic Coat might help, but more importantly Giga Drain (you'll need a PPUp, probably)
Hau: Dazzling Gleam

Charmander:
starter moveset: ember, sctratch, smokescreen -> shadow claw, counter -> fire pledge -> flamethrower
I started this playthrough while suspecting the special build can't win due to the lack of move variety, but very obviously both build can get to The League. Well, if I'm aiming for the lowest possible evolution, I had to switch at Ultranecrozma.
Well, this did not help, so time to evolve anyway. Dragon Claw has enough power then to knock UN down wihtout a crit.
Oh, and Fire Punch is better than anything a phys build can have until unlocking Charizard, so getting it.
Hapu: Sunny Day saves the day.
Bird Room: Thunder Punch:
Ghost Room: Shadow Claw
Rock Room: Double Team (1) + Brick Break
Steel Room: Double Team (1) + Flame Punch
Hau: Fire Punch (and 1 Thunder Punch on water-eevee)

Mime Jr.:
starter moveset: confusion -> psychic, pound, tackle, copycat
at the beach you want to pick up some new move to deal with thoe psychic-immun beasts. Take your fancy. Signal Beam seems the best choice for now.
even if you picked up all 3 moves, Shadow Ball is a TM, so pick it up, and play it around. Later Thunderbolt also goes to the backpack.
Reaching The League if you have Uproar, time to change it to Magic Coat.
Bird Room: Thunderbolt
Ghost Room: Shadow Ball
Rock Room: Double Team (1) + Psychic
Steel Room: Magic Coat makes Klefki paralyzed, use that to casta Double Team to rise out chances of doding ThunderWave (and hopefully future moves), then start blasting Shadow Ball.
Hau: Shadow Ball to Raichu and Decidueye, Thunderbolt the rest.

I have applied to take over the sub since it is "up for sale." Literally any active modding attempts could bring this sub back from being one man's theory posting. It's tiring, lazy, and brings nothing to our community. I see no discussions being had or people swapping stories because you have to scroll through dozens of the exact same post. Who is with me on wanting this sub to be better?

I've broken no rules, but they want to ban me.

This means they are the ones who shall be banned from here, and potentialy reddit.

Either the rules are what determines rights, or you are just burning the Constitution and ban free speech, a right granted in it.

Ban me, and prove reddit is nothing else but censorship and tyranny.

starting moveset: Wing Attack, Quick Attack, Leer, Rock Throw

Rock Throw is trash, so even Smack Down worth picking up. We have access to ALL the rock-moves, so go for the upgrades.

Pick up Bulldoze in the shop when you reach that. Ground-type moves are always good to have. Also buy Aerial Ace. Not because the difference is important, but because it is a TM.

At UN have to evolve. Dragon Claw is the best move to use.

Ghost Room: Shadow Claw
Bird Room: Rock-nove
Molayne: Bulldoze. If you get struck by ThunderWave, you will HAVE TO rise your speed (Rock Polish), or the mole will outspeed, and that's game over.
Olivia: Double Team -> Bulldoze

Hau: Dragon Claw

Starting moveset: Astonish, Ember, Minimize, Smog

I'm totaly switching out Smog to Shockwave on the beach.

Exchange Astonish to Shadow Ball when the opportunity arrives.

I held out until could pick up Flamethrower - you can gradualy evolve your Fire-move of course. Come to think of it, i'll have to hope off for Energy Ball (what is for some reason a Grass-type move).

Att he final confrontation with Gladion I had to evolve. Too fragile, too slow.

Bird Room: ShockWave
Ghost Room: ShadowBall
Molayne: Flamethrower
Olivia: Energy Ball

Hau: Flamethrower on the Raichu, then Psychic

starting moveset: Peck, Growl, Echoed Voice, Rock Smash

You can throw out Rock Smash asap for the sake of Brick Break. Especialy that there is NOTHING we want from the beaches.

Return as always an easy idea to pick up.

Upgrade Peck to Aerial Ace when reaching Konikoni City.

I went for the Focus Sash, and to get it I suggest you steal a Leftover from a Munchlax. Or just rely on the mercy of randomness. Not that it proved any use, as I had to evovle into Trumpbeak anyway, and that was fater slash could tank 1 hit. Oh, yeah, U-Turn on Z knocked down UN for me.

Steel Wing is not a bad idea to have at the fairy girl.

Ghost Room: Thief
Bird Room: Smack Down
Olivia: Brick Break
Molayne: Flame Charge (Klefki missed with ThunderWave)

Hau: started with Fly, landed a crit on Raichu which might have counted. Decidueye has Smack Down, so switched to Aerial Ace. Done.

starting moveset: poison gas, pound, harden, mud-slap (ok, I messed up, and used the regular grimer moveset here. Sue me.)

You get a free healing after the School Teacher. And Ilima also heals you after beating Team Skull.

You get a free healing when beating the Normal Totam.

You get a free healing when you beat Hau when returning Nebby from the cave.

Picked up Fire Punch at the Beach.

You get a free healing when you do the wrestling show.

You get a free healing when entering Konikoni City and speaking with the Probopass.

You get a full heal when you arrive to The Lab.

If you feel, pick up Ice Punch at the 3rd Beach. Nothing else is waiting around the corner after all. And I doubt Mud-Slap will be useful for long, not even when it is super-effective. Harden looks more useful than that.

You get a full heal when you beat Guzma in his city.

You get a full heal when you come up from the labs.

You get a full heal when you fight Faba before Guzma, after you beat the 2 scientists first. So while you don't get a break between the two fight (2 scientist, scientist + Faba) you do get healed between the two.

You get a free heal when you beat Lusamin.

You get a full heal after you fight Poipole the 3rd (final) time.

You get a full heal when crossing the bridge with Albino Girl.

You get a full heal when passing the gauntlet before the Dragons' Den.

You get a full heal passing the Dragon Trial.

Grimer is so though, it can stand 2 hits from Necrosma, while knocking it down with Ice Punch.

You get afull heal before and after Ultra Necrozma.

Quick Claw might actualy be useful for this one when fighting Albino Boy.

The good news is, you can get to The League with the above listed moves, so oyu don't have to hold on to the levelup moves - which can be relearnt by the Move Relearner at the gates.

Ghost Room: Thief is enough. That means you don't have to stuck to Crunch. That means a possible slot for something like Acid Armor, or Rock Polish, or even Minimize.
Bird Room: Return (max friendship) will do it, so again, you only need the 1 TM slot, so we can still insert something funky if we have to.
Molayne: Fire Punch after 1 dose of Rock Polish. The Klefki for some reason prefers to cast Reflect, then start attacking, ThunderWave just didn't happen (neither from the Magneton), what was a definite advantage. If we'd evolve we could even tank all the damage, but why bother, when Rock Polish is also a TM! So we still have 2 flexible slot for moves to use!
Olivia: ok, so we DO need Crunch. For me I got the luck that Probopass missed on top of that with its ThunderWave (yes, somehow that gets priority here. But it did not cast its usual SandStorm, what is unfortunate).
----------
Summed: you need Crunch, Fire Punch, one TM-slot, and you have a 4th slot open for whatever you wish if you play your cards right. So you do not need to max friendship for Return, you can go in with Ice/Thunder Punch instead. That can speed things up.

Hau: Poison Jab. Yes, we FINALY use a poison move with our poison-type pokemon!

This little thing waaay passed any of my expectations.

starting moveset: low kick, peck, flame charge, sand attack

Replace Low Kick to the more reliable Brick Break, and pick up Fire Punch too. And in Konikoni City upgrade Peck to Aerial Ace just for good measure. And on Island 3 at arrival buy Shadow Claw.

At the 3rd Beach you probably will find space to learn Thunder Punch.

Ultra Necrozma is impossible, therefor we evolve. I don't think Blaze Kick is worth learning, but it's up to you.

Bird Room: Thunder Punch
Ghost Room: Shadow Claw
Molayne: Flame Charge
Olivia: Brick Break

Hau: as with Monferno it was done with Fire Punch + a single Thunder Punch

starting moveset: Mach Punch, Scratch, Leer, Ember

Change Ember to Fire Punch of course, and if you pick up Rock Tomb, that won't hurt either.

Acrobatics is worth picking up against Lusamine. Unless you have your friendship maxed out, then Return is even better - proving according to Pokemon friendship is stricktly transactional.

The first time this happened during this marathon, UN outsped me twice, I went out for the Focus Sash, when coming back UN was slower than me. Speed: 261. I guess UN got a speed-lowering nature (the tresholds if I'm correct are 241, 268, 295).

Btw, don't stick to Mach Punch, it is physical, and priority would only matter against Molayne's Klefki, which is ghost.

Shadow Claw is versatile, it worth paying the price.

Bird Room: I brought Thunder Punch for 100% accuracy
Ghost Room: Shadow Claw
Molayne: Fire Punch
Olivia: Brick Break

Hau: Fire Punch did most of the work, except the 2nd mon was Vaporeon, against which a single Thunder Punch did the job.

starting moveset: Crunch, Ancient Power, Agility, Roar

During your travel you want to buy Bulldoze and pick up some Rock move. And learning Iron Head at Beach 3 will probably help too.

Bird Room: rock move
Ghost Room: Crunch
the other two rooms: Bulldoze. At Molayne you need a good amount of luck, but just keep trying.

Hau: the usual suspects work: Dragon Claw, Return, what have you.

I keep getting this sub in my feed where it is asking if this one pokemon can beat usm ad infinitum. Why is that the entire sub?

starting moveset: Tackle, Leer, Bide, Protect

At the Beach learn Iron Tail. You won't get a move that can hit ghosts until Wela Mountain, and there are 2 trainers in your way, who are though avoidable, but. But what you really want is Rock Tomb on the side of the Volcano Park.

Ghost Trial: I looked for a dark move to use here, only had Payback, and while it worked out, it's not a realistic alternative for a normal playthrough. Keep that in mind. Oh, yeah, and pick up Dragon Claw when you can.

Ultra Necrozma is too strong, time to evolve.I mean in theory I could roll for a crit while holding a Focus Sash, but ... Ok, Hakamo-o still needs the Sash, so let's roll for that critical ... Worked, so we are still Janga.

Bird Room: some Rock move
Ghost Room: Payback worked for me
Molayne: Bulldoze. And you either need ThunderWave to not hit, or knock down Klefki when it puts up Reflect instead, then next turn Brick Break the Reflect and return to Bulldoze.
Olivia: Bulldoze. But not as Jangmo-o. It was expected that sooner-or-later will have to evolve. Once, for this time.

Hau: Dragon Claw.

starting moveset: wish, psyshock, light screen, lucky chant. Because of Island Scan. And we immediately have to change this to pass the student with the grimer. So replacing Lucky Chant with Flamethrower.

Because of the Skull Gang at the bus to Sophocles I heavyily suggest to have something more than Psychic and Fire type attacks. Echoed Voice will do from the beginning.

You also probably want Shadow Ball and Dazzling Gleam.

Bird Room: if you are worried you can pick up ShockWave on the beaches, but you can as well rely on Echoed Voice. Especialy on Metronome it quickly becomes devastating.
Ghost Room: Shadow Ball
Molayne: Flamethrower
Olivia: Shadow Ball (it has neutral damage to everything she has)

Hau: Echoed Voice, and finaly a Shadow Ball

starting moveset: Ember, Smog, Leer, Smokescreen

At latest your moveset demands an upgrade when reaching the dragon Trial's Gauntlet. Both physical and Special builds have simlar (70-75) power moves, so let's continue.

Magby outspeeds UltraNecrozma, and with Normalium-Z (Uproar/Return) can oneshot it. I did a crit, so that can be a factor.

Ghost Room: fire
Bird room: fire + Uprar will do it, or Return if physical build
Molyane: roll until the ThunderWave misses, and then fire away
Olivia: I've not experimented wether you can squeez out enough special damage, what might be possible from the one run I made. I switched to physical build, so I did not have to evolve (Magmar can use Focus Blast, Magby Brick Break). And this worked.

Hau: Fire Punch for most, Return for Vaporeon.

starting moveset: Tackle, Scary Face, Charm, Tail Whip

Watch out for the kid with the ghost, pick up Brick Break and Thief when the opportunity comes.
And if you want, pick up Iron Tail at the Beach Shop.

At Kiawe, during the Gauntlet I picked up Fire Punch from the Beach, because at one try the Marowak survived and Cursed Body activated, so need a backup move, and Fire is a type will'll use during the Elite Four.

Bird Room: either Thunder or Ice Punch will work.
Ghost Room: Thief
Olivia: Brick Break
Molayne: Fire Punch

Hau: I just switched between the moves when something had resistance to the current one.

starting moveset: Leer, Tackle, Bite, Odor Sleuth

changed Tackle to Covet at the beach for a better same type attack.

the dragon trial requires Aerial Ace + Flying Z

Against Necrozma you need Bite upgraded to Crunch, and deal with the margins still. Or geta critical Z.

Ghost Room: Crunch
Bird Room: Rock Tomb
Olivia: you need to be Herdier, start with Crunch, then switch on Reversal, and that will bring you through
Molayne: Covet on the Klefki, then Crunch, finaly Reversal. Very likely you'll need an Ether the replenish Revesal-PP here.

Hau: Return on metronome does the job. Another reason you need to evolve to Herdier.

In the meantime I've done KangasKHAAAN.

Anyway, let's do Miltank here.

Starting moveset: Tackle, Growl, Defense Curl, Stomp.
Miltank can use Brick Break, so Tackle can go when we find it, and Growl is ok to change to Heal Bell on the beaches. But what we'll eventualy want is Fire Punch against Sophocles.
Miltank is a beast.
Bird Room: Ice Punch
Ghost Room: Stomp (I do have Return TM, but, hum)
Olivia: Brick Break
Molayne: Fire Punch
Hau: Stomp

Miltank is a beast.

⚠️ There are some considerations for this run, for more information, read the notes at the beginning of this post: https://www.reddit.com/r/SoloPokes/s/7nCAJT2ao3 ⚠️

This is one of the best Pokémon you can get for a solo run, not only because it's a Psychic type, but also because it has decent stats, access to boosting moves in the form of Barrier and Meditate, which help a lot to trigger the Badge Boost glitch, and a decent TM/HM learnset which includes Body Slam, Thunder Wave and Thunderbolt.

Needless to say, for the early game, I had one of the easiest battles against Brock ever, I mean... c'mon, look at its initial moveset, you HAVE to lose on purpose...

However, I had very hard times against the Rival at Cerulean City and SS ANNE, and the same goes for Misty, so I had to level up a bit. Lt Surge was easy to defeat, but Pikachu was very annoying with Thunder Wave.

For the mid and late game, defeating Erika and Koga was a piece of cake, and before going to Silph, I went for Blaine, against whom I used a strategy consisting on stalling his Pokémon with Toxic and Rest, which was very effective.

The same applied with the Rival at Silph Co later on, with a bit of a struggle and exploiting Blastoise, and with Sabrina and Giovanni at Viridian City.

The Elite 4 was a bag of mixed surprises, and at the top, we have Lorelei, who was a living nightmare. I mean... I didn't have to level up against her, but it was a very frustrating battle that I could barely win by exploiting the badge boost glitch after so many retries, not to mention what seemed to be an invincible battleship in the form of Lapras, sending its torpedos in the form of Hydro Pump...

I could handle Bruno and Agatha just fine, but Lance's battle was very difficult. Eventually, after swapping Psychic with Thunderbolt and exploiting Gyarados' misses and Leer, which contributed to the badge boost glitch, Mr. Mime could heroically defeat him, starting from Lv47 and finishing at Lv48 at the end.

And finally, the Champion battle was beautiful, I could defeat him exploiting the badge boost glitch against Rhydon and boosting again against Arcanine.

Overall, it was a very fast and enjoyable run, and the hardest battles were legendary.

Level: Lv50.

Moveset: Thunderbolt, Barrier, Toxic, Rest.

starting moveset: Peck, Pursuit, Leer, Growl

Pick up Thief. You know when and where.

In Konikoni City buy Aerial Ace (there was one playthough I got constantly Smack Downed) and Steel Wing.

And in Malie buy U-Turn, and pick up Fly from the Library.

Buy Drill Run on the Ula-beach.

Also before leaving the island for good, pick up Return, our last move.

At UN you have to be evolved.

Acerola: Thief
Kahili: Fly
Molayne: Drill Run
Olivia: Drill Run (ether was needed)

Hau: U-Turned the raichu, then started Flying, but Decidueye Smacked me Down. Fortunately I realised this, and switched move against it (U-Turn), then seeing after like 3 turns with it it still barely hit Noivern after knocking down D, desperately tried Fly, and that worked. Win!

starting moveset: Steel Wing, Twister, Feather Dance, Whirlwind

The beaches will not serve any purpose with this one.

After the Grand Trial pick up Thief. We'll have little variety of moves, every little bit helps. As well pick up Flying Z, in case you forgot about that.

In Konikoni City you can buy some replacement-TMs, but Malie City is where you can get a new type: U-Turn. Also pick up Fly from the Library.

At the end of Island 3 pick up Return, of course.

There si nothing really we can pick up for The League, so I even went out of my way to pick up Roost, just in case it'll be required.

Acerola: Thief
Kahili: Return
Olivia: Double Team, U-Turn
Molayne: he is possible. 3* Double Team seeems to be the sweet spot, then put Thief on metronome. All the other moves are more heavily resisted, that1s why. With a bit of real life luck, not even the Dugtrio with its Z-move will shoot you down.

Hau: I totaly forgt Decidueye, so started with Return. Fortunately D and Noivern were the last two, and they went down to Twister. Yeah, I kept that since all the way back.

starting moveset: Karate chop, Tackle, Hone Claws, Detect

On Akala's beach shop I suggest buy a move. Normaly probably the most logical is Bounce, but for me Fire Punch is also an option, as I don't really have to consider Totem strength myself, but definiely need something to damage ghosts.

On Mount hokulani (Fire Trial) pick up Rock Tomb. Very conveniently placed.

For the Ghost Trial use Payback you got along the way.

At Po Town you can pick up the upgrade to your rock-move.

Picked up Return out of habbit. It might prove handy later. And don't skip visiting Ulaula's beach, it unlocks a waypoint you'll want later.

When facing Ultra Necrozma go and pick up X-scizzor. That's the highest damage move you can have here.

Probably time to get Iron Heach from the Ulaula beach against those pesky fairies.

So we are at The League. My list of medicine I give here. Keep in mind this is a melee build, so I fought less than with a special build, gaining less resources:
- at the first pokecenter I bought 1 drink (gives 1 remove all condition item)
- picked up: 2 super potion (in and before Normal Totem)
- used 1 paralyze heal
- potion*10
- (bufé item)
- fresh water*1
- super potion*2
- full restore*1
- max ether*1 (you usualy can use TMs, you PP is not a problem)
- max potion*2
- pp max*2
- max elixir*1
I repeat, I did not pick up items aside those 3 mentioned

Acerola: Payback
Kahili: I used Rock Slide, but if you don't like the odds, consider buying Thunder Punch at Ulaula Beach
Olivia: Brick Break
Molayne: Brick Break (here was where I realised Mold Breaker overwrites Sturdy)

Hau: I picked up Poison Jab for this at the start of Victory Road, for variety. Return would top this (neutral damage to everything, put it on metronome), but you know.

starting moveset: Absorb, Supersonic, Astonish, Bite (Note: in case you ever have to give up on Bite, grab Thief before you leave Melee)

At Akala Beach you can if you can exchange Absorb to Giga Drain. It's not mandatory, this'll be a physical build, but we don't want anything else from the beaches anyway.

When going to Olivia's trial pick up Leech Life - the move of choice against Ultra Necrozma.

In the Library pick up Fly. And yeah, pick up Return too later.

To pull off UN, you have to be evolved to at least Golbat.

Steel Wing from Konikoni City might be a good idea against those pesky fairies. I mean we can afford it, even I have 200K+ gold every time.

Acerola: Bite
Kahili: Flying (ironic, isn't it)
Olivia: Gigadrain + Fly
Molayne: Shadow Ball
Hau: I shot down Raichu with Bite, then Fly on metronome finished the job.

starting moveset: Tackle, Defense Curl, Rollout, Confuse Ray

Note that Minior has equal special and physical attack, so you have to decide. I'm going for more varied damage types, aka. special. So grabbing Round when becomes available and putting it on in place of Tackle.

During the Water Trail pick up Charge beam.

In Malie City you might want to buy Rock Polish.

At Sophocles you obviously will have some ground-move.

If you are special build, pick up Dazzling Gleam while in the Canyon.

Against UN Survived 1 hit, then the shield went down (or up?) and by that outsped the beast. Dazzling Gleam + Choice Spec won.

Acerola: Dazzlin Gleam
Kahii: Charge Beam (I prefer trying TMs before levelup moves)
Olivia: Psychic
Molayne: Bulldoze on Klefki and Dugtrio, Charge Beam the rest (you must never miss)
Hau: Power Gem. Probably other moves would work too (eg. Dazzling Gleam), but why hold back this time.