The article should be at Crown apparently, and the intro too should be changed accordingly
I have not checked all English names of items, but can only verify those mentioned at Glorious Gold and those I verified previously (but I personally assume gamefaq is accurate; possibly youtube can help verify)
Checked, all good!
I don't know whether there is an official term like "Schätze der Welt" that encompasses the Ancient Treasures, the Never Hungries', the Eight Treasures, and the Golden Items—I assume there is not. But if there is, however, and someone knows the English equivalent, I propose we could make it a dedicated page, where we would copy the individual items from their articles, and link whenever mentioning "Ancient Treasures" etc., including on this very page here (that's just my idea, there could be a better one)
Apparently, that better idea is to create a "Treasure Collection" article (without copied items), and link there (apparently the term is unofficial)
I haven't had time to (confirm and) include the locations from gamefaq (they're not on the German pokewiki page) yet; everything that's on any individual dungeon page is reliable, though (that information is also on the German wiki, but I think it's just as detailed; I could check, or add later)
Not for this article
For me, it seems like you immediately get the crowns, but maybe you receive them from Ampharos or something; youtube, probably
The order is shared between the German wiki and gamefaq, so I presume it makes some sense to keep
The following is missing, but should/will most likely end up in an incomplete tag, unless someone can do it:
for the Never Hungries' the Germans say they look like donuts, and that they have been created by the "legendären Schleckermäulern von Team Sattmacher", which literally gives something like "legendary/infamous honey-lovers of Team Saturation" or so? If anybody has a clue...!?
VioletPumpkin had a clue. I've added it for now, but it apparently doesn't belong here anyway (see above).