As I was poking in the web to save edit my MH3U save, I stumble across this japanese chat/forum site, whatevs.
This is the site : http://savedata.jp/3dssave/mh_bbs/joyful.cgi
Anyways, I read at the bottom of the BBS site (yes its in the bottom part of the page), the MH3G item codes. Well...