There are Pokémon of all sizes in this universe. The largest on Earth like to live like living islands, enjoying a life of luxury without having to worry about anything other than eating more and more.
Thanks to technological and biological advances, there is no such thing as illness or disease. Drones are made to carry food from one place to another, and they also act as cell phones for the immobile creatures.
I see my bird girls are having a good time here, on vacation in Alola.