Alright... So apparently this idea in my head has blown up into another entire arc idea -I really need to stop letting these get so big- Though it can be placed aside other arcs.
The Basic Idea.
Giratina, our resident bored gamer extraordinaire and possibly troll on the level of Mew is... bored. So, to pass the time when he gets bored watching Cyrus, he decides to make up a little game using some choice people from the regular world he can bring into the Distortion Realm. Thus, however many cast members want to can join in a diabolically twisted version of a Pokemon game. This is the False Region Arc.
In more description:
Giratina, by his own choice, constructs a fake region within the Distortion Realm, and kidnaps/requests the help of certain people within the real world to make it a proper game. There is no world-shattering consequence to this arc, and though the players will believe otherwise as per Giratina's decisions, no lives will really be on the line. This is just Giratina deciding to have some fun on a bigger-than-average scale.
By a fake region, I mean just that. A region with towns, brainwashed NPCs standing in place waiting to say their one line, and 8 Gyms with badges. *Where Giratina goes more overboard is in the way he plays his game. By default, it appears to be a Nuzlocke Challenge, as in if a mon faints, it dies. And in the False Region, that goes for NPC and Gym Leader mons as well.* Furthermore, each Gym Leader (called a Pokemon Master by Giratina) is actually a very high-class trainer from the real world, typically a League Champion or legend in their own right. I'll explain this more later.
This is meant to appear like a darker than average arc to the players, so naturally it's not meant to be for everyone. This is merely meant as what can be a side-arc during another arc, so RPers can pick in advance if they want to be a part of it.
The Gym Leaders/Pokemon Masters.
Now, the main reason I planned to give for why anyone would want to play Giratina's game in the first place was to release all the other players who are trapped in it. As Giratina's promised, when the game is complete, everyone inside (except Cyrus) will be released back into the real world. Most of these trainers are meant to be high-class trainers, so yeah.
Each Pokemon Master will be thoroughly brainwashed, though. After all, Giratina doesn't want them to just hand the win to any challengers. Each Master will, in turn, be sporting a twisted personality according to whatever inner issue Giratina decided to bring out and use as the focus of their brainwashing. Some will be out for non-descript revenge, others following a deluded sense of justice, and some just want to destroy everything [read: Cyrus.] These 8 Pokemon Masters will also be parallels to the 8 Robot Masters of Megaman 2, another game Giratina is currently into. (Subtle it isn't, but then this whole idea isn't subtle.) Besides the usual badge, each Gym Leader will also hand over one Mon they used and represent in the game when beaten, to use on the others.
The current (up for debate, changing, et cetra) list of trainers and their parallel Robot Masters are as follows.
AirMan: Lance.
MetalMan: Blue.
BubbleMan: Wallace.
Wood(Wo)Man: Green.
HeatMan: Cyrus.
Flash(Wo)Man: Cynthia.
QuickMan: Steven.
CrashMan: Red.
The reasoning behind this is meant to be because their individual personalities can be twisted and warped to fit the molds of their Robot Master counterparts.
Speaking of, Giratina is never one to half-heartedly attempt something like this, so each and every gym will be akin to the stage the Master is part of. So you'll be flying high above the sky in Lance's stage, dodging numerous metal deathtraps in Blue's stage, and having to out-run instant death lasers in Steven's stage. Fun times, but you can always use your mons to help.
In summation...
This idea is still a WIP. I am using The Megas' songs for inspiration on a lot of these characters, but I'd like to hear any thoughts on this. Personally, I think it would be a good test of world-building skills to make this world from scratch, a dark shadow of a real Pokemon region. But that's just my opinion. Floor's open!
Orchestrated Chaos... A symphony to live by.