Mosstone, Alisland and Airisland

Mosstone: People have long thought to have seen "Pet Rocks" scurrying away. Mosstone are grass and rock types, but have developed an inner system that allows them to float on water.

Alisland: They stay on large islands to feed off the soil and swim to the next once the soil has depleted. Based on its fins, some say its actually a large fish covered in dirt and plants.

Airisland: They are abused by treasure seekers who believe they are magical. So they escape into the sky and float among the animals.