How does the Sinnoh Great Marsh Work?

[Aidenjc]

I was wondering if anyone could explain how the great marsh encounters/areas work. I've spent a lot of time hunting their for Safari Week and it seems the encounters shift/shuffle with each in game day and it also seems some encounters are just not available on certain days. Also the dex as pokemon like Wooper listed as "Very Rare" but with the percentages I have been encountering pokemon it seems more like a common/uncommon given the area and day. Any answers would be great so I can effectively hunt skorupi! Thanks! 

[Zuladra]

In Great Marsh very rare encounters (Skorupi and Carnivine) bounce from one area to the other and are available at a rate of 1%.

 

Lures and OoB ability like Swarm can be used to increase encounter rate and swarms of these mons can appear in all regions.

 

Good luck!

Edited June 9, 2023 by Zuladra