i havent found them either but you can take the japanese rom and edit that one, then drag the edited narc files into the usa rom
it works for me, i use poketex to edit and then drag the narc files to the usa rom
if you need any help on which files they are then just tell me ill post em
oh and my other account is chris12341 if you guys havent noticed, i made 2 because the first one wasnt able to get verified...until like a hour after i made and verified this account lol, idk what was up but i wasnt getting the verification e-mail