For the all 6 boards (battle royale/tag battle), the rules do not specify if you need to win each board. Also, why is all 6 boards (duel battle) a category? Thats what star battle arena is, minus a few cutscenes and the final minigame. It makes no sense to exist.

fixed the 1st thing and 6 boards duel battles is there for different difficulties and just to put all possibilities of 6 boards on there