This is a really cool project to see! I was literally looking for something like this not too long ago and disappointed no one had ever considered doing this. PkHeX has a nice pkmdb feature, but something like this is way more interesting to use. I would love to see you continue to give this updates!
I downloaded it and gave it a go, and it works great. It's very simple and clean, too. Only thing I couldn't figure out was why the save folder option wouldn't do anything (I could open files fine, but that one button didn't have any response).