You don't open ROMs with PKHeX, you need to open your save file (it's called main) if you just want to get a specific Pokemon.
Read this tutorial about how to get your save file.
Remove the Sinnoh Champ ribbon and you should be good to go; the ribbon names were just swapped
https://github.com/kwsch/PKHeX/commit/d19705f5a9c54cebbc0e4e5e837efdcab53981b0
I have backups of Ultra Moon, female, but starter is Litten, and pokedex is complete. Not sure if you want it.
I use PKSM (directly on my 3ds) and it automatically backups before editing things, so it is very helpful, that is, if you have a real 3ds.