I actually like how Sird is used, like a Bigger Bad, someone playing the long game over decades/centuries, towards an as-yet-unseen goal; as for the 'centuries' bit, there are sporadic hints that she wished for immortality from Jirachi X,000 years back (replace 'X' with whatever number you wish).
If anyone wants to contact me, they can do so at the following sites, under the corresponding name.
Serebii Forums; Xadhoom.
Youtube; Xadhoom Xado.
I swear I didn't mean to kill that thread! Or the other one! Or any of the twenty-fifty threads I've killed. It was pure luck!