Which Horse appears in the Last Bossfight?

Bonus info: the “Default Horse” won’t have an icon on the map or a name. If you whistle while you’re too far away from the horse, you normally get an error message saying “[Horse Name] isn’t able to come” or something similar, but during the last fight, nothing happens. No sneaky way to check for an “official” name for that particular horse ;)

Why the “Default Horse” is special: it is the same horse that appears in the memory flashback cutscenes. It also has unique stats and can only be found in specific herds. For more information, check out HylianAngel’s guide here: gamefaqs.gamespot.com/switch/…/links-horse