Quote Originally Posted by .:the chocobo master:.
Also you need to make sure that you don't do any digging outside of missions until chapter 5. I'm not entirly sure on why that is but i read it in the walkthrough of my PS2 magazine...
You don't have to do no digging, you just have to dig so that you don't get many parts for Experiment. So basically you can dig all you want just don't get the yellow X's very often, or at all to be safe.