How I beat the alpha dragon with R-Reapers

So I decided to fight the dragon once again and this time I used an R-ReaperKing and an R-ReaperQueen with 100 imprint it wasn't to hard for the two Rockwells it's just getting as much hits as we could when the dragon wasn't flying after a 5-10 we defeated the dragon

Moral of the story? Use reapers for bossfights