Basic premise:

In the Pokemon world's feudal age, the nation of Johto launched an attack on the kingdom of Kanto, landing on the south shore.  Normally sea invasions bring few pokemon with them, as they have to carry the food and water for those pokemon as well.  This invasion seemed to bring hundreds or thousands with them, as the soldiers needed merely to throw what appeared to be an Apricorn at the ground to bring a captured pokemon into battle.  The Johto soldiers quickly managed to secure a literal beachhead, and even capture a few villages.

The King sent out messengers to every village under his control, ordering the Lords that weren't in battle to assemble their armies at his Castle Town of Pewter.  The messengers also delivered secret messages to certain people who had worked as agents for the King's court before (the players), ordering them to assemble in the tavern of the village of Palegh, near the enemy's captured territory, and meet his agent there.

[hr]

We would have a few pokemon with us each, though pokeballs don't exist, just "Apriballs" which only Johto people have, so we have to take them with us like pets, and provide food (and maybe water) for them.  Humans are generally Normal type, but we can learn pokemon moves as well.  If a human can't do it in the real world, though, we may need equipment (including magical equipment) to use pokemon moves.  For example, you would need a metal weapon/shield to use Steel type moves, or a fire stone to use fire moves.

I have only beaten the first and second generation games, and only their regions are involved, so only their pokemon are allowed.

I'll definitely need a Co-GM for this, as I have to many RPs going already, and need the help to keep the story going at a good pace.

(Pokemon are from "the stars" and are generally of roughly human level intelligence, but most lack much of our creativity, leading to us being better strategists and having better tech.  They are called "pocket monsters" because when they first arrived they were hostile to humans.  The only way we could befriend them is to carry their eggs with us, generally in pockets, and raise them among humans.  Eventually they formed a peace agreement with humans around the world.

They communicate mostly through body language, with their speech only being needed for verbal cues, like tone.  Anyone can learn to understand them with enough study, and they all learn human language as children.)