don't forget EVERY trainer having a full team of 6 level 100 pokemon and plenty Sturdy mons, shadow taggers and counter/mirror coat shenanigans when they aren't using the field to destroy you...also probably a bunch of different sections with different field effects. Probably will have every cavern type field effect and a few others that she can muster (Crystal, Dark Crystal, Cave, Icy Cave, Dragon, Super Heated) with maybe some of the annoying atmosphere effects like Steam or floors like slippy floor or heck a maze of diving spots, hell even more frustrating would be a longer and more difficult version of the mysidia cave (with the puzzle being go through the correct sequence of entries or start again in order to reach the end with the answers likely scattered throughout the cave and probably on the trainers themselves, each room probably would have a trainer or trainers and hell, mercy on your soul if you need certain field effects combined with the correct path to proceed (example North = Incorrect, North + Crystal Cave = Correct) but would probably be far too difficult and would be easier to simply make certain routes only able to be used if certain field effects are in play.