I have just beaten the garbador horde in the wasteland grotto, i saw that there is meant to be the dawn stone and other items availible here. I have all the other items apart from this item (must be the dawn stone) which is trapped behind a mineable rock. I mined the rock but theres no way to acess the pokeball to pick up the item as it is blocked by the rock shell and the other rocks. i saw on others playthroughs that the pokeball was just located in the middle of the room instead.