Hello,
Thanks for the answer, yeah it was something with my scarlet save file.... idk where I mess it up, I was tryin to complete pokedex in order to can cath exclusive past paradox to transfer to my violet save file. Something strange is that PKHEX can't open this file but restoring the save back to swtich the scarlet game launches it without any issue.....
But as always before start editing any save, I did a backup. I restored this scarlet backup and started again the editing.
Anyways thanks again for your time , and I proceed to close this post, and wait to future stable build release.