Okay...40 hours later, here are some things to report:
I think the Undersea Cave is missing some maps: Looking in AdvanceMap and there's some maps present, they WERE present in older versions, but they're not here and appear to be the only location of DCRumia.
Also, the waterfall in Undersea Cave crashes unless I use it from the menu,
I cannot find DCRemilia or DCYuuka on any map.
The floor of the ghost tower where you fight your rival has Sweet Scent encounters, but nothing of value...?
I kinda miss Pyonta from the old versions; Now we're back down to like three bug families.