I’ve only recently made that spreadsheet. About 2 years ago I had a word doc I used to use (although I’ve never shared it). But after my HDD broke without a proper backup I stopped. This year I’ve reorganized my entire collection in their binders and made that spreadsheet.
I do have an Instagram with highlights of my collection, as well as multiple collection spreadsheets like my Pikachu collection. I also have a YouTube channel with a few Pokémon collection videos (although barely any). So maybe you’ve seen one of those before?
EDIT: Or maybe you mean my National Index collection. I remember you’ve commented on it before.
Greetz,
Quuador