Just a suggestion, but how about having one Shaymin in one form and another Shaymin in the other and have them as siblings? Like with Latias and Latios.
That would be cute, but I think I'll stick to the main Shaymin just showing off her other form.
The whole idea of this story is that the Legends are super rare, so I'm writing it as if there's only one of each, having others around kind of defeats the point
