Dylanさんのイラストまとめ

Seeing as Route 209 already has some Ghost-type Pokemon appear, and the Contest Hall is right next door, Mimikyu would fit right in; alternatively, it'd be hilarious if it was available alongside Pikachu in the Trophy Garden, trying desperately to fit in and appeal to Mr. Backlot

I know you expect big things from "the place where time stands still", but it's still unreal how well Eterna Forest manages to capture such strong vibes of peace and serenity. Don't you just feel you could fall asleep without a care in the world?

...well, so does Komala!

Unlike most places that let you change Deoxys' form, Sinnoh has what is heavily implied to be natural meteorite craters in Veilstone rather than lab-captive meteorites. Being able to encounter Minior on the routes bordering Veilstone would be some fun world building

I mentioned before how it'd be nice to give more reason to check out the actual lake grass, and I think Wimpod would fit in as a rare encounter for Valor Lakefront. Typing aside, a Pokemon who evolves and outgrows its constant fear seems like a good showcase of willpower

Stufful and Bewear are said to live in areas generally considered dangerous and off-limits; the overgrown grass and dense fog of Route 210 would fit that description pretty well

Alola was said to be the last region where Mudbray natively roam the wild (and I will forever be pissed that their appearance in Galar goes completely unexplained!) but given the Great Marsh's contained status and its rather muddy appearance, I think it and Mudsdale would fit in

While reviewing this list, I realized there was a severe lack of Poison-types compared to the others, so Mareanie and Toxapex are here to remedy that. I could see these two being available in places like Route 223 or Iron Island exterior, outside the region mainland like Corsola

Wishiwashi makes a lot of sense as an additional fishing encounter for lower-value rods like the Old Rod and Good Rod. Making the school form available while surfing on Route 223 would be a fun little surprise too

I think Rockruff and Lycanroc would fit in as general encounters along the big Eterna-Hearthome-Solaceon-Celestic loop. I don't remember how Galar handles their evolution but in this case I imagine it would just be time-based

I'm torn on whether these two should be a Honey-based encounter or just a general encounter around the Floaroma area. Whatever it may be, I think Cutiefly and Ribombee would make a ton of sense here. The latter's even got a scarf for the cold weather!