pk3DS VS NHSE

You might be able to build it with those encounters with pk3ds if a hack including all exclusive wild encounters doesn't exist.

Maybe possible with pk3DS or you can try editing your save file with PKHeX.

There are two main ways the game is modded, the first is by editing the save file of the island which requires backing it up and then using an editing tool like NHSE to edit stuff like items and acres, there's also supposedly ways to do it while the game is running but I've never done them before.

Well for a save editor that you can use in game you can always try using the sys-botbase ram edit function found in NHSE or you can use ACNHPoker both of these allow you to edit the save in game though they do require an external device to run the editor on.

The most efficient way I use is NHSE it's much faster than digging up the flowers manually by hand, though you need to be careful because it will also remove furniture and trees if you're not careful. If you do this be sure to take backups so if you mess up you can still go back to before you made the changes.

NHSM works by storing your islands in a separate NHSM "islands" directory found in your user home, and when you want to use a particular island save it will swap out the local save on your selected emulator with the one in your islands directory. This release also includes integrated NHSE (New Horizons Save Editor) support!

The only thing I personally have done is use the New Horizons Save Editor (NHSE). But I don't play online so I didn't even care if what I did was safe.

if op has hacked their switch it's probably possible, but nintendo really doesn't like giving their users any sort of freedom outside of playing the games.

To you nook stop designer that's available always even when not on internet. It's part of the main game. Special items will be mailed to you though Nintendo. For those items i suggest using NHSE you can get it here. https://berichan.github.io/GetNHSE/

I only found one example of this exact error, and the solution posted by the NHSE dev suggests that it was caused by not running the program properly. Specifically, they suggest that the user must have been running the EXE file without having the rest of the program files in the same folder.

Save Editor: Edit/Transfer Villagers, Maps, Literally everything Edizon can't do. Link: here"