Thank you so much, this helped a ton!
I was somehow assuming that we are still on .sav files (I did editing in 4. Gen already and somehow was still on that).
I was modifying Luminecent Platinum and was somehow assuming that it still works with the normal pkhex (lumi has a modified pkhex which worked and I was not aware of) since a lot of romhacks based on Firered etc. worked with normal PKhex.
Anyway; case closed, thank you so much, you were a big help!!!