Gameshark and other similar "cheating" devices are generally frowned upon here, as far as I've noticed. If you're not getting responses, it's probably because a majority of the member base doesn't seem to use them.

Maybe it's just me, but if the only things you can't get are the Wyrmhero Blade (why would you even waste your time?) or the Duranjo... I don't really think there's any value in cheating to obtain them. Things like the Wyrmhero Blade are superfluous to begin with--by the time you get it, you've already beaten everything that it might actually help you defeat.

The only value to either weapons at this point is if you're a completionist. I'm not quite sure why, after putting in all the work to get everything else, you'd stop so short of the goal.