I return, and find a pleasant surprise: action a lá Rhydon (or possibly Rhyhorn; the description doesn't quite let me reach a decisive conclusion). That was all well and good, and I loved the Sableye - honestly, is there anyone who doesn't like Sableye, for concept and looks at least?
I've no major complaints, but there's a couple of things I'd like to point out:
This sentence means their ears were doing the flittering. Now, not only is 'flitter' not a word - it appears to be a conflation of 'flutter' and 'flit' - but it seems to me that it's more likely that the Zubat were doing it, rather than their ears.
Speaking of Zubat, you could have made it more obvious where they came in - at first, I missed the bit that said the cavern filled with screeches, and when you mentioned Zubat, I was confused. Then again, that's probably just me being an idiot.
Should be 'movements' - there's no need for a possessive apostrophe there. Their movements do not own jerky, however amusing a concept that might be to muse upon.
You had two clauses here that started with 'just'; usually, in a sentence like this, you'd only have one, because it's more effective and reads better. I'd move the bit about the Rhydon/horn breaking through the wall to a different sentence, if I were you. Also, considering Riolu's small size, would a 'massive foot' not just squish its whole body instead of merely its head?
Anyway, the story continues to be engaging and interesting, despite these little things. I await future updates.