Well, I decided to give chocobo breeding a try, and after much irrelevant questing and running about, mummy and daddy chocobo finally made a genetically superior green chocobo. The problem is, I'm running about on the airship, but I either can't find, or can't get to, the remote cave with the mime materia in it. There's a cave north-east of Mideel, on a long island, but it doesn't seem to be the right one, as the green mountain chocobo can't get past some sort of cliff. Help!!!