This tutorial is made with the presumption that you are capable of understanding and following simple steps.
While you may ask questions on details regarding the subject, you CANNOT ask on the how to inject/extract save file, how to install CFW etc.
There are other tutorials for that (and this tutorial presumes you already know those things)
Required items
1. PKHeX
2. able to extract and inject a modified SWSH save
3. A working internet browser (in case you wanna check what den ha