>>33359291There are numerous 'ocean activity' tents in Hawaii near the sea, where tourists can go to access scuba diving, snorkelling, etc.
They are going to let you explore tiny little areas under the water (imagine a small Dive spot from RSE). A little bit of grass for pokemon, some coral, some crystal blue water.
The Rotom Camera has opportunities to take photos down there too.
You'll find Corsola, Mareanie, Wailmer and some other pokemon like Clamperl line, Horsea, etc.
It'll allow players to add more Water-types to their teams earlier in the game. And crucially, it's the most basic bitch lazy way to add new areas to Alola... and we know Gamefreak are lazy mofos.
Screencap me, remember I said this.