Okay, this will be my first time trying to make a story. I will try to do my very best in making this a good story. So please review.
In this universe, there exist two worlds. One of these is Earth, where humans and creatures called Pokemon coexist. There are regions in which trainers battle and befriend different Pokemon. However, there are also regions completely void of these creatures and only believed to be a fantasy. People in these regions have yet to experience the adventures of trainers and live only lives devoid of the outside world.
There also exists a Pokemon world, where there are only Pokemon exist in that world. There are many perils within that world that endanger the many inhabitants of that world. To combat this, groups of pokemon come together to form rescue teams, groups that are willing to help others in need.
These worlds have yet to make contact with each other. However, there is a phenomenon that allows humans to cross over to the Pokemon world and become these creatures themselves. One human, however, did cross over to the world and went back to Earth. He had saved the Pokemon world from a calamity that would have left the world in ruins. He is known in stories as the torchic with the cross scar.
So…, how was that for an opening? Its probably a bit bad to my opinion. But the how you want to rate it is up to you.