Hey, am back again, just to tell you that everything worked perfectly.
Here is what i did for other people to not ask again and have a faster idea what they can do:
-> I transferred my save data of PKMN scarlet from my non hacked switch to my sys stock on my hacked switch.
-> Then I booted into syscfw and used jksv to make save data/back up.
-> Afterwards I connected my hacked switch with my pc.
-> The next step to was copy the whole folder of my save file to another location as a backup.
-> Then I copied it again and edited that copy in pkhex. After that, I exported the edited file to the 2nd copy of main and replaced it. The replaced copy then was added into the save folder on my SD card of my hacked switch.
-> I booted into syscfw restored the save file via jksv and then booted into stock sys.
-> I used the regular data transfer method to get my edited save file from a hacked to a non hacked switch: press + on the games icon (both consoles):
-> select data management and transfered the edited save file from stock sys (hacked console) to my non hacked one.
-> i tested the game and went online with my non hacked switch. I joined a random raid and everything works fine. my edits also came through.
if anything happens in the future i will share with you