I don't think there is one atm, but I'm not sure why you'd want to have a save editor for monster hunter anyway outside of loading yourself up with zenny. Anything else would just defeat the purpose of playing it in my opinion considering the basic formula is to grind out monsters until you get the armor, weapons, and other assorted gear you want. Sure a save editor could speed up the process, but once again that makes playing kind of a waste of time(just my opinion though. Feel free to disregard it)