Well, there should be some restriction if you do. Like the Gracidia Flower only blooms in one very remote and hard to get to spot. And Shaymin isn't exactly that tough. Not unless it's in Sky Forme. And Shea has a point, there are lots of Shaymin out there. More than many non-legendaries I can think of. And Shea has already said (s?)he is ok with it starting really weak. The only thing that worries me is that the others might get jealous. I personally don't care if Shea gets a Shaymin. John has enough going for him as it is. (*Looks at the whole clone side story.*) Anyways. How about this? Shea can have a Shaymin, but under these strict rules.
1: It starts at a really low level, like 5 at the highest.
2: It is the only pokemon that Shea would start with.
3: There MUST be a good backstory behind it. (This is probably the most important one.)
4: No Gracidea flower for a very long time. Until Shea has collected more badges than John and Israel have combined at this very moment, so six badges or more, right?
5: Shea must complete some long and drawn out side story to even find Gracidea Flowers for Shaymin. And you know I'll get John involved to muck things up. Just to make it even more difficult. (*Grins evilly*)
Does that sound alright? I know it sounds a little harsh, but this is a legendary we're talking about. That's my take on it. So, in my opinion, Shea can get a Shaymin, but the road will be very hard for a very long time for them. And it's not like John and Israel have anything to worry about from that grass type. (*Grins at Cinder and Blaziken.*) If you take my rules, it should be fair. If you alter them so that they fit how you think it should be done, or if you decide that Shea can't have a Shaymin at all, it is fine with me. And I really don't think anyone else will mind of Shea gets to start with a Shaymin, especially under those circumstances. Does that sound fair?