That sentence was not coherent. Usage of punctuation is key.
Still, I would try to parse your statement.
you're welcome
At least for Ursaluna BM, I think you can check the IVs without saving, so you can always just SR the game.
So, do you mean to reactivate the event flag with PKHeX? PKHeX can't 'soft reset' the save for you, and I am not sure if the event flag is even researched and detailed.. Anyhow, if you intend to modify your save in order to be able to "soft reset", might as well perform 'save scumming'.
First, make a save backup from before you caught Enamorus.
Then, catch Enamorus, then make a save backup via JKSV, then revert back to the said in the above sentence.
Do this around a few hundred times, then check all the Enamorus in all your saves.