Your actual animal kingdom/web of life, for definite.
Fooor example: cordyceps fungus (worse than science fiction, but essential to balance in the rainforest), the "immortal" jellyfish, fungus being the largest living organisms -- and allowing plants to communicate with each other and warn of infection, even across species! The titan arum corpse flower heating up and "pulsing" to release its rotten scent and attract insects. Orchids that trick wasps into thinking they're a female wasp to get them to pollinate them... Giant earthworms, and clams that live for over four hundred years. Salp colonies. The blue whale having a heart the size of a small car. Orca having, effectively, names, and a sense of culture - they teach each other, and learn. Heck, even mother hens correct their chicks if they think they're doing something wrong -- they learn so quickly. AND they're the closest living relative of the T-Rex. : D
This world trumps pokemon everytime. It'll never be anything more than a brief, sketchy shadow of a copy with a good dose of human imagination. And that's without bringing in the real cuties of the animal kingdom.