Fuyucchann

If it about aurora veil then how about Frostmoth . you can catch snom from headbutt tree in evergreen it can learn stun spore, infestation, feather dance, defog, aurora veil, blizzard, bug buzz, tailwind , wide guard and quiver dance you can use it as a set up sweep or defensive utilities/support Also having more other good under hail pokemon is good too, you can switch them in and out depend on the battle

I think so blizzard learn via heart scale and dazzling gleam is a evolve move , you can get moonblast via breeding too

Yes it is obtainable via trading alolan sandshrew ( i think in v13 it at evergreen) at the pier of Kristiline town (the lady at the 3rd pier from up-down)

I have some ideas: 1. Alolan Ninetales also have snow warning and it can learn blizzard , Aurora veil , having either dazzling gleam or moonblast will help with Fighting type weakness and maybe nasty plots to setup 2. Scarmory provides more hazard like spikes and stealth rocks (so can keep flash cannon on empoleon for stab steel) the rest of move set is your choice 3. Change Abomasnow's Sound proof to Snow warning (it would be change to Snow warning after mega anyway)

Unique

like he said, this will make Ghost monotype run is difficult even for easy difficulty so i guess you could add a ghost-type (via debug mod) after every gym until Goldenleaf.

after Damien take you back to route 9 , you would be near a station, take the train there it should show you option for tournament , as for the bug u simple just load up a back up file , i reckon you would save after the battle against Ren so load at that point

weird are you sure that it is night , or maybe i could be wrong about the lady behind the counter so talk to everyone there instead lol

in the emerald building , talk to the lady behind the counter ( i could be mis remember here ) the go to the 3rd floor at night you should encounter a shuppet

I think Diance is in possession of Karen, i suspect we will see it active somewhere if Karen still alive, maybe in some sidequest

I love this Ghost type so i will pick Decidueye for this Type: Grass/Ghost (as normal) Black Shard Ability : Technician Base stat: Hp: 78 + 31 = 109 Attack : 107+38=145 Def: 75 + 30 = 105 Sp.Atk: 100 Sp.Def:100+10=110 Speed:70+67=137 Legendary move: Spectral Thief Normal move: Dual Wingbeat Set: Item: Life orb / Decidium Z Ev: 252 Atk, 252 Speed, 4 Def Nature :Jolly Spectral Thief Dual Wingbeat Spirit Shackle Leaf Blade As Decidueye is slow with 70 base speed i see that it could use a higher base speed and i went with Technician just to power up Dual wingbeat and possible Shadow sneak if replace Spirit Shackle but since it a signature move and can use Decidium Z with it i kept Spirit shackle

Try to set up on her with Politoed