@kaytee Okay, how bout don't do ANY of those things.
First, load up a save file in PKHeX.
Then, create as many mons as you like.
Then, Tools > Data > Dump Boxes. Choose a folder to dump to.
(alternatively, File > Export SAV..)
If you go by the Dump Boxes route, the folder will have lots of PK8.
To import them into another save: Tools > Data > Load Boxes