>>29855162From what I remember -
There's the wall where you first find out.
The Beach in the first city
In the hidden cove you find by exploring the yellow flower place, there's one where you can photograph Slowpoke
Second island, I can't remember.
Third Island has one halfway down the Observatory route.
Geothermal Power Plant.
About to do Ghost Trial. That's all I've found so far. Will reply in a bit since I'm hoping to comb the first 2 islands again for any I missed.
>>29855796In Lush Forest, where you do the Lurantis trial. It's in the area with the tree that has a Formantis jump out at you.
>>29855931One island produces beans (Currency needed to upgrade) and attracts wild pokemon.
One island gives you the option to grow berries.
One island lets your pokemon search for shards that you can trade in for things in the Festival Plaza
One island lets you EV train pokemon easily
The final island lets you raise pokemon's happiness and you can dunk eggs in the hotspring to make them hatch faster (Converted to hatch in real time rather than running up and down)