In Legend Mode, there are Gold Skulltulas you can only get on hard. Doing a little bit of research online, they only appear when you meet certain objectives, which are different for each level. I can't find any hints about these objectives in the game, though.
Does Hyrule Warriors give any hints about where to find hard difficulty Gold Skulltulas? If so, where can I find these hints? If the game doesn't give direct hints, are there any subtle clues I should I look out for?