Monster taming one:
I have two to go off of. One is a poke-clone, the other is more jade cocoon 2/cubivore.
Post nuclear war (where have we heard that before in my games? XD), society struggles to rebuild itself. Animals, however, have developed special, almost magical traits to survive. Mythical creatures such as elementals and dragons have appeared, and even plants have started to manifest sentience. Animals grow stronger by eating the hearts of other "tainted" creatures, and begin to manifest their prey's traits (Wolves with scales or wings anyone?).
In the very distant future, overpopulation has become a major problem for mankind. Technology had led to the discovery of inter-dimensional travel. However, as no other dimensions were in existence, there were none we could travel to. But the technology had given way to something new: pocket dimensions. People could have their own personal little worlds.
Along with this new technology there was something new that arose: The ability to create life. Artificial life forms were made (long story short: we mades pokemanz).