I kinda just decided to complete a living dex in X because I had the time and didn't really know what to spend it on and kinda just wanted the Shiny Charm so I could get a shiny Mawile. Never ended up getting it.
I've kinda just transferred that up every generation so I could get the Shiny Charm for a lot less work, but the Galar Dex in Sword was something I did before HOME dropped and did everything on my own (that I could, until I needed Shield exclusives) as a mental health project because I really needed a break at the time.
Earlier this year I heard people saying that Gen IV is the hardest to get a national dex completion because of requiring the GBA games, necessary transfers, and the lack of options like the GTS and Wonder Trade. I was already using an emulated copy of Platinum to see if it was possible to transfer my save file to a physical cartridge so I could help some friends of mine, and I ended up using that save file to test if I can emulate things like the Pal Park and Dual Slot. I have a national dex of 489 and I kind of don't want to finish it, just so I can prove I didn't hack in a full national dex. Maybe leave it at 492 or something.