Had this idea awhile back and just thought I'd put it out and see if anyone bites? For the quick summary, consider this a mashup of Pokémon Conquest, ReBurst, and the Battle Bond from XY.
The Setup-
In the distant past of the Pokémon World, there exists a region where humans and their Pokémon are one and the same, quite literally. In this region, warriors that are able to achieve the greatest of bonds with their Pokémon are blessed with the power of the Unity Phenomenon. With this phenomenon, the trainer and the Pokémon share their power and the trainer is enveloped with a powerful armor in the guise of their respective partner. With this newfound 'armor', the trainer is then capable of fighting alongside their partner in combat for a brief period of time. Those that achieve this strange power are summoned to the kingdom capital and are to be trained as the Pokémon Knights.
However... there are those who seek to use this blessing for their own gain. A dark force has appeared within the kingdom and it threatens to upturn the quiet and usually peaceful lives of the people. In desperation, a team of young knights and their partner Pokémon are sent on an adventure through the region to find and defeat the forces that would threaten the kingdom and it's people.
A little generic to start I know, but I only really started putting this idea to paper recently. The idea of humans fighting with Pokemon has always fascinated me and while ReBurst was... an attempt at this idea, I think I can do it justice and deliver a cool, slightly more adult version of this concept and in a way that keeps the spirit of Pokemon as a core concept.
Also, I got the idea for this rp from this really slick piece of concept art someone made. If anyone who wants to join is an artist, I'd love to come up with more armor concepts and keep fleshing this idea out over time.
EDIT: Hey, finally doing those edits I promised! So... here's our setup.
The name of our setting is the Rallen Region. Located somewhere between Kalos and Galar, the Rallen Region is home to House Aegis, a monarchy that stretches back to time immemorial. The monarchy is ruled by a King and Queen, with a group of Ministers overseeing the various aspects of the region (War, Foreign and Domestic Affairs, Currency, Agriculture, etc.). Outside of the nobility, many people in Rallen lead simple lives as either farmers or artisans. However... if a child is discovered to be capable of the Unity Phenomenon (A trait possessed by less than 5% of the Populus) they are sought out and are offered the chance to become a Knight of House Aegis. By accepting, the children are quickly enrolled into the Knight's Academy where they are paired with a Partner Pokémon (If they haven't created a bond already) and are trained in the military arts to defend and protect both the royals and the people of the Rallen region.
The Unity Phenomenon typically manifests around 10-15 years of age although later cases are occasionally reported. Training at the academy typically takes about five years, and students are expected to perform duties as Knights while still enrolled. While these years are brutal in terms of training, the rewards of Knighthood greatly outweigh the costs and it's considered a mark of status to even have a family member who becomes a Knight.