So, some of you probably know that in the Glittering Cave you can find Old Ambers by smashing rocks. Well, I was just in there, and it turns out that after you defeat the Elite Four, you can get other fossils too! I was just in there for a few minutes, and I got an old amber, two cover fossils, two plume fossils, three skull fossils, two helix fossils, and seven dome fossils! I didn't seen any of the generation three fossils, though, but I don't see why they would be excluded...