From what I have seen of that game, the world map is incredibly primitive, around 80's-desktop-computer level, interspersed with cheap animations of pokemons in front of background scenery.
And the concept of wandering around the real world looking for made-up animals takes video-game wastage to a new level. How about looking for real animals instead? Isn't anyone interested in real wildlife? (Besides birds, to all the idiot duck photographers out there.)
There's bugs, and snakes, and scorpions, and rabbits, and water striders, and minnows, and raccoons, and bears, and beetles, and ants, and lizards, and bobcats, and wolves, and spiders, and skinks, and geckos, and mice, and chipmunks, and squirrels, and horses, and cows, and goats, and wild boars, and anteaters, and hedgehogs, and mantids, and crayfish, and catfish, and silverfish, and clams, and lobsters, and snails, and frogs, and toads, and all kinds of critters.
I don't know how many types of Pokemons have been invented but I doubt it's anywhere near as many as the 60,000 species of vertebrate animal out there, never mind the millions (counting undiscovered) of invertebrate species. Other than going to a pond to point a camera at a damn duck, people would rather stare at imaginary creatures on a screen than the real ones around them.