after you get the detective stuff from Bushstep defeat the three bosses (theres one at death valley, one at the beach, and one in the forest)
sorry if this is a bit late, but you start by fighting snakes (in death valley), then fight snake (the boss in death valley), then fight the fish at the beach, then Mystic (the boss at the beach), and finally, the bears in the forest, then Thunder (the boss in the forest). Then it should be done unless you didnt click on Ashfall already with the clear benonite