[Help on Mono Ice run]

The field is especially stacked against you here. I don't think you'll have access to Aurorus or Rotom, which would both help. Or anything with a tailwind.

A Masmoswine if you have one might be able to clear some of her team with earthquakes, IF you can outspeed her. Tailwind will help, though the only mon that would technically count for that is a castform, which is only an ice type in one weather, so won't count for a mono run. No Ice pokemon that have sticky web either, which is a lifesaver in doubles. 
Masmoswine with rockslide and earthquake might be your best bet here, apart from water/ice types that might be able to tank a heat wave or two. Cloyster's SpDef is quite low so you'll need to make sure you cover it somehow so it can shell smash and not get wrecked on the first round. 

[How to get choice scarf and choice band]

Thanks, I found it again. I edited my post. 

[How to get choice scarf and choice band]

Here's what I recall for the Eeveelutions: You need to pet them before the E4, and most have some disappearance condition. 

 

Umbreon: Vanhanen Castle 
Espeon: Glass Workstation

Glaceon: Glass Workstation

Vaporeon: Fiore Mansion

Leafeon: Behind the Mirage tower, need surf to reach it. 

Sylveon: Victory Road

Jolteon: Nightclub 

Flareon: Route 1

[How to get choice scarf and choice band]

If I recall correctly, you get a choice scarf if you pet all of the eeveelutions. You can get a choice band or choice specs depending on whether you do the magma or aqua gang questline to conclusion. Finally there is the victory road spirits quest. 
I might not be remembering correctly but I think that's correct. 

[Team Recommendations? Agate City]

I found that a Cincinno (with good IVs, naturally) was one of my favorite mons. King's rock, skill link, plus tail slap, bullet seed, and rock blast make for a very versatile attacker (those 3 can be taught with a move relearner). Tickle makes for a surprisingly useful debuff too. I'd recommend adding the Cincinno to the party, mine proved very useful. (Too bad I don't think Reborn has Triple Axel for ice attacks, because that would be awesome)

[Team Recommendations? Agate City]

Well, I do try to have a decent team set up before going to Agate City for the first time, main reason is once you go there, you can't go back, which means a lot of pokemon that you could have caught become unavailable until you get the Fly machine. I get the impression it might be too late for backtracking, hence you won't be able to get a Tyrantrum unless you have an old save, but you might not want to go back that far. 

 

I liked having a Cincinno, myself, but I don't think you can backtrack to the location needed to grab one, alas. 

[Team Recommendations? Agate City]

I'm used to swapping my team in and out, though depending on where you are in the game, you may not be able to get some of the pokemon I recommend. The last time I did charlotte's gym, I had a Tyrantrum with Earthquake and Rock Slide, an Archeops may fit your team nicely too, with typing and tailwind/stealthrock support. That said if you're already at Agate Circus, then you can't go back to revive a Tyrantrum, since that requires going to Spinel Town. Tyrantrum at least provides some heavy hitting, although you'd need to pull off some breeding shenanigans to get one with Dragon Dance. 

 

If fossil pokemon are currently unavailable though, Lycanroc can help. You can near the Fiore mansion use fishing to get a Horsea which you can evolve into Kingdra for additional type coverage, and also you will need a surf-compatible mon soon enough. (Hope you picked up the Good Rod though, you'll need it to get the Kingdra.)

 

 

[Can you help me organize my team?]

Personally? For Gaia, I'd swap out Energy Ball with Leech Seed. Giga drain's already a good attack move, and leech seed can help vs bulky enemies, and with various special cases. (Like Sturdy 1HP targets). Venusaur is bulky enough to take advantage of stall tactics too. 

For the Electivire, you already have two electric physical moves. I'd swap out wild charge with either Power Up Punch (Buff), Thunder Wave (Debuff), or Rock Slide (Useful attack for doubles that won't hit your own team). 

I might also recommend swapping out one of the dragon attack moves on Bahamut for swords dance. 

[Pokemon Reborn E19 Hall of Fame - show off your game-winning team! (Now with tier list)]

So here's the team I used. They had good but not perfect IVs:

Spoiler

Ixen
Charizard
Moveset: Heat Wave, Air Slash, Solar Beam, Tailwind
Item: Charizardite Y

 

Caliburn

Aegislash

Moveset: Shadow Sneak, Sacred Sword, Swords Dance, King's Shield

Item: Leftovers

 

Ternesj

Garchomp (Shiny)

Moveset: Earthquake, Dragon Claw, Rock Slide, Swords Dance

Item: Leftovers

 

Bloom

Roserade

Moveset: Giga Drain, Venoshock, Leech Seed, Toxic

Item: Black Sludge

 

Coaster

Scolipede

Moveset: Poison Jab, Megahorn, Swords Dance, Protect

Item: Black Sludge

 

Silk

Weavile

Moveset: Knock Off, Ice Punch, Ice Shard, Power-Up Punch

Item: Air Balloon

 

Side Notes: I was considering replacing Silk (The Weavile) with Squark (Alolan Raichu) or Fluffles (Cincinno), but I opted to go with the Weavile instead for better type coverage. Especially since otherwise the team doesn't really hit dragon types too well. Still, it covers what I needed.

 

 

Spoiler

Strategy wise, Caliburn handled a lot of it himself. Get him against an enemy he can king's shield stall, swords dance, then sweep. Toughest fight was actually vs Laura+Bennett, I thought Ixen+Ternesj could heat wave/rock slide sweep them but they were faster, plus with the rain+sun made it a rainbow field, which isn't terrible to work with but their team outspeeds mine unless I get a tailwind up. 

 

Speed boost Scolipede can run some cleanup especially vs fairy enemies or things which the Aegislash can't.

 

Vs Anna and Lin round 1, I lead with Ixen. They try to start with an Aurora Veil alolan ninetales, but the Charizard Y transformation cancels the hail and then causes the Aurora Veil to fail. Used tailwind then heat wave to start, but having the tailwind set up means you can sweep more easily.

 

One last thing, for the Lin round 2 fight, any grounded pokemon /need/ to have an air balloon or the field effect will hose their speed. (I got Silk to down 2 of her team that way, would have been 1-hit-KOed otherwise) Her team is built around that, but yours probably isn't. 

 

[Max XP Pokemon do not gain EV]

I have noticed when attempting EV training on my mons, that if they are already at the badge XP cap, that they do not gain any EVs after winning a battle either nor do they gain any XP. I assume that not gaining XP is intentional, however I suspect that not getting EVs is not. Training EVs thus requires using a reverse candy so they can gain XP normally again. 

 

Tested this on both game.exe and game-z.exe.  

[Trading and Focus]

Recently when attempting some trades online, I've found some issues, with the trade hanging for one or both of us, and sometimes, one person trading a mon getting theirs while the other keeps theirs. 

 

I've found out how to replicate this bug.  Because of the capacity for exploiting, I'm putting the replication steps in a spoiler tag.

 

Spoiler

Essentially, in order to cause replicate this, it involves losing and gaining focus at the right times. First you need to have both log in, then make the trade. Before the trade is confirmed, lose focus, (you can tab to a chrome or firefox window for this). If one side does this, then the trade will indefinitely hang for them. As long as one side maintains their focus on the game, then the trade will go through properly for them.