The story is kind of lengthy, so I'm gonna cut it down to size, for you :3
Basically, it's been 1000 years since a human has been around, and Pokémon are living in communities and cities, but have shunned all technology due to it being the Humans' supposed downfall or summing.
One day, 200 years ago, a Pokémon found human ruins -and- machinery, and learned to use them. He spread the word of this, and some Pokémon backed him up and created The Mechanists, wanting to learn to use these gadgets and whatnot, and create their own country, away from where they live now.
However, the Council (Made up of five Pokémon, the rulers of this land) will not have them breaking the rules of the land, and have sent the Knights of the Oran to dispatch them. They've been fighting a war against them for 200 years now, and the Mechanists live in Enclaves, hidden around.
The Mechanists are allowed to use gadgets, weaponry, wear clothes and... basically, be free, while those under the laws of the Council are unable to wear clothes, only the Knights may wear armor, and females are considered weak and inferior to males.
Aaaand that's basically it! The MEchanists are trying to stay alive and get to a different land and make it for their own, and the Knights are out to stop them, as well as protecting the citizens of the land.