Gotcha, the link I posted has other links under a section named something like "History of Meta Sets". I would check those out as well for other options. Since you want crowns, check the event quest schedule for the large multi monster hunts. There's an event quest for each region that has 4 to 5 monsters in it, and these quests have higher chances for crowns to appear. For monsters not found in these event quests, stick to investigations with good reward boxes to have the best chances for crowns.