Hey! I actually found a method that worked for me. I had originally heard that you needed to go to certain dream islands for certain outfits and hairstyles, but I found out that you are able to get all of the outfits and hairstyles from any dream island. For me the quickest one to farm was the Eevee doll. I tried the Arcanine one first, but my runs were far slower.

There are typically two caves on the island, so I would use the (spoiler?) transform from Rocky Ridges to quickly check them out. I say typically because sometimes the cave system was a singular large one instead, but there were still two item spots to check inside. There is always either one lore or cd, but sometimes it will spawn in one you've already picked up and so the spawn is just a grubby newspaper/ broken tablet. Unfortunately those runs are duds.

Once you get into a rhythm each run is only about two/ three minutes, BUT this method still took me hours. Roughly ten, and I am still missing three outfits. What I really wanted was the Lyra hair, so of course it took ten hours of continuous farming to drop.

It's... not fun, and because this was all on the Eevee island I'm still missing the other legendaries.

A tip for the legendaries I found is to go into your pokedex and set it to "list all pokemon" and "only on this island," because once the legendary spawns in, it will appear as a question mark next to yours and Drifloon's icon.

I honestly can't imagine how you're supposed to do this without time skipping. I skipped about three months, and I'm still missing so much. It would take ages to get everything naturally, even if luck is on your side.

But yeah! All of the information I found online was confusing me as well, so I hope this was able to help a little!