Personally I think the Ladyl woods is kinda full. We got four characters there at the moment.
but having Corivana stumbling upon Claire and Groudon could be interesting. Don't really know how you'd work Kyogre into that though, since you know, land. And Groudon and Kyo would probably start going at it the moment they saw each other. Well...actually, Groudon would probably want a nice long nap after the fight with Axia, so unless Kyo did something he'd probably ignore her xP