How did you manage that? So that I can do the same...thank you in advance.
there are a couple ways you can do it, you need to have JKSM and the latest version of pkhex (for PC) and you are good.
so if you have those two things. load in JK Save manager (either through Homebrew or on you main 3ds menu which would need to be installed there via FBI)
find your pokemon game (it will either be in SD/Cia or under Cartridge depending which of the two you have)
Click on Save Data Options
The Export Save
Then Click on New
and name it: main
(make sure there are no Caps and it is the exactly as i typed it lol)
This will export your save file from your copy of the game
Once you are done that, go back 3 times and then click exit.. at this point after you are out of jksm so can turn off your device and remove your sd card
put your SD card into your computer
once it is in you will need to open up PKHex
click File
then Open
at this point you need to find the main save file that i was telling you to export earlier
which should be located in Removable Disc/JKSV/Saves/(whichever game you are playing either Pokemon Sun or Moon)/main
the file should be in that location
Open it up then you should be able to edit the pokemon in your boxes.
Select a box where you want your dittos, then start making them.
Im attaching a link to a my dropbox so you can get the 6iv japanese ditto (it is modest), drag it into your pc as many times as you'd like then change the nature of it until you have every nature covered.
https://www.dropbox.com/s/tjrdo7g89xajhdv/132 ★ - Ditto - 6079173A8D46.pk7?dl=0
once you are done editing dittos, and anything else in your PC Boxes, click file, export SAV and then save it to the location of where you first opened it from your SD card.
after that you are done with PKHex, close the application, eject your SD card and place it back into your 3ds.
Open JKSM
find your pokemon game (it will either be in SD/Cia or under Cartridge depending which of the two you have)
Click on Save Data Options
The Import Save
Then Click on main
and say yes to the confirmation
This will import your save file to your copy of the game
after that you should be done
turn on your game, check pc, and WIN
you can use them to breed for better ivs (destiny knot), get the nature you want (with everstone) or use them to masuda method and shiny hunt.
Links for stuff youll need:
JKSM:
https://gbatemp.net/threads/release-jks-savemanager-homebrew-cia-save-manager.413143/
PKHex:
https://projectpokemon.org/
shout out to the awesome people who worked on these programs