there is also a prism scale, deep sea tooth, a totidile event that I couldn't figure out, he keeps jumping out of the water when you moved but I couldn't get him to battle, a deep area that bottom is just darkness (creeped me out) you could find some underwater pokemon like clamperl, dewgong, chinchou, qwilfish Relicanth but in that area if you hit the enter/space button a error message shows up and closes you out....
EDIT: Ame you put so many different paths in there, I was trying to cheat to get back to the main city, but couldn't find a path, guess Ill continue looking