As I said, your can keep your starter for every region but sure if you want to be a grass gym leader you can be another Gym leader in Jinga, who pops up every now and then.
He did catch them all, but Released all but Rayquaza and Zekrom. However, the Anime has shown us that there are more then one of each legendries so it is still possible for other to catch their own Rayquaza and Zekrom
Bad news guys, I've overslept somewhat and I need to walk my dog, then I have friend round after about 12 so I might not be able to start the RP till tomorrow afternoon at the earliest.