This was posted on Pokemon.co.jp about Shaymin, a grass legendary only obtained in the USA with a Action Replay DS or CodeBreaker, you can recieve Shaymin with Action Replay by Downloading the code, included in the Maxs' Action Replay Database. Shaymin will be added to the PokeDex Project
Click
Here to see the article translated into English with Google Translate
Shaymins PokeDex Data Will Be Up Soon