So I got to start out by saying i was wrong I did NOT have gyshal greens in my inv. I only had the Mimett green Key item. So i was wrong with some Info i talked about with others.
Now for the issue. When you get to this point IF you only have one gyshal greens in your inv. And you get the green choco. You go over the river complete the dungeon. You will be Hard locked. What i believe is happening is When you go into the near by forest The game is checking for gyshal greens to get the green choco and not the mimett greens. Now im not sure if that can be changed or not, If not a fix could to just but a person that can sell Greens in all the Forests. A sudo fix for now, always carry greens on you. I had to restart the game to figure this out. Yeah im a person that does not do back up saves. Anyways Good day.