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So, there's a neat failsafe event to give the player an old amber after you beat the boss but couldn't get it immediately afterwards due to having a full inventory, which given how limited it is and how many items there are spread around this place is almost a given, but there's no cap, so you can essentially get infinite old ambers by interacting with the scientist at the entrance of the lost world.
Oh also, is there anything around this place besides the Kanto fossils? I remember there were a few betamon fossils that got scrapped, I looked around but found nothing besides a strange Strength puzzle that said a distant door had been opened, I didn't find any other doors in the islands, but also didn't check the puzzle leading to the nest before doing it so I dunno if they are tied.