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160 years before the events of Pokémon as we know the today, the regions were caught in the web of ever rising conflict...
Rival nations, Johto and Kanto, have been competing for centuries. At times the tensions have risen to the waging of wars between them. Bad economics, unscrupulous trade, spreading disease, and idea theft has been enough to spark high tensions between these two.
Recently, an unknown Pokémon (Mew) has disabled all the automated weaponry on both sides. (However machines are still usable, such as cars.) Being stranded without weapons, both countries have seen a lull in war. It has been 30 years