Well the FS Celestia and Luna has yet to show up anywhere in Sweden. Then again... neither has brushable Lyra, Trixie, Cherry Berry nor Sunny Rays. I don't consider any of them rare though as they are quite easy to get a hold of through Ebay and similar.
Star Dreams is the same deal - but reveresed
![Tongue :P](https://mlparena.com/Smileys/default/tongue1.gif)
There are several swedish toyshop sites that have her for sale and I had no issues what so ever in getting a hold of her. But as the others have said, she didnt seem to make an apperance in the US.
And Diamond Rose has been easy to find here and she seems to have been easy to find elsewhere too.
So as mentioned, the only actually 'rare' G4's are some of the more elusive prototypes such as Minty, but I'd say that's about it.