what i fear is a shaymin situation myself.
after rotation, it will, by my prediction, be akin to Shaymin-EX or the current Tapu Lele-GX in terms of price.
I understand the thought process, but the main difference here... is that she has a lower rarity version available.
Since that's the case, it's more realistic to speculate based off her supporter counterparts; N, Sycamore, and Guzma.
Which route will she take though?
Personally, I feel she will be a
Sycamore, which is the reasoning behind my original estimate.
Though, she could very well be a
Guzma, stabilizing around
$35-$60 while she's in the format...
Or even an
N, who's standard market price is still
$89.44 (Noble Victories FA).
I think the artwork matters a lot here, which is another reason I'm confident with my estimate.
I don't really like Cynthia's FA; I felt the same towards Sycamore.