User blog comment:Mckrongs/Monster Hunter 4 for the Nintendo 3DS/@comment-6050823-20130614003330/@comment-4815503-20130614143433

Taking a closer look at the isolated Kanji used for the title,"化 ", it seems the monster's title may have more to do with the concept of transformation or disguise more than anything else, apparently with a sinister or deceptive undertone.

It seems the verb can also take the the meaning of changing for the worse, including the process of food spoiling, so perhaps that's where the translation came up with "garbage".

I certainly could be wrong, though, but I thought I'd post what I could find.