HEY GUYS I'LL SHOW YOU HOW!...I found it on this web site:http://www.igamehack.com/2014/07/gamesave-monster-hunter-freedom-unite.html here the the same instructions from the website above (The ones in the pretices are the ones i wrote)
Download the game save backup at Download files and extract it.( The game save file that was posted on this website) Delete and reinstall the app. (I didn't do this) Logout of Game Center, Open the app till you get to the menu, then close the app from the multitask. Put the documents folder in the 「MH Unite\Documents」 using (iFile, DiskAid, iFunBox...) or other apps. (I use iFunBox it's easier, plug your device in, then open ifunbox and click your ipod at the bottom left corner, then a new screen will pop up that will have all your stuff in it, click iFunBoxClassic and a screen of it will pop up, when you click it open wait a few sec for it to load, then search for User Application and open it, finally Put the documents folder in the 「MH Unite\Documents.
It will ask you to replace the old documents folder, do so. (Didn't ask me,so I just replace it with the hacked save file) Launch the game and don't load save from iCloud. Ask if you still have trouble, I'll try to help.