The Sky is a small map compared to the rest of the world on the ground. While there are four regions full of dungeons on the ground, there is literally nothing in the Sky besides a shortcut between towns. My idea is to add a town in the skies and expand the surrounding areas.
My thoughts for this town would be:
-Made like a large O with the inside being where you go between towns.
-Add a Storage and Assembly.
-Flying Type NPCs and NPC Houses
-A shop with items you can only buy there.
My thoughts for the area outside the town would be:
-A dungeon in the skies/clouds.
-A Rayquaza somewhere (I don’t know where exactly, but just somewhere._.)
-Locations that require Flying Types to access.
-Different weather in different locations.
I also think that there should be more Fly locations around all four regions. Maybe add one on South Outpost Island or near Skylift.
Why should The Sky be bigger you may ask. In comparison to the ground, it is an insect on the skin of a dinosaur. In PMD1 and 2, there were dungeons in the sky. There is a Mount Skylift on PMU, but it’s a mountain, not something up in the clouds. Other than that, there really is nothing really big in the Sky.
TL;DR - Make the Sky bigger, it’s boring up there.
Feel free to comment/criticize.