Professor said it was in Shimmering Caverns...but I remember that I found one of these materials in the place that her said me wrong. So I think you are right. Thank you very much!
So I am stuck at the missin Trial and Error. I found all the materials expect nectar. I can't find the nectar cuz I can't find the Monarch on Shimmering Caverns. I tried so many times activating green tiles but no, nothing.
