Can I play this game on a Mac or Linux?
As of right now this game is only available for Windows. You might be able to run it thru Wine for Linux. And on your Mac you could run it on a Virtual Machine.
I recommend VMWare Fusion do emulate a Windows installation on your Mac. But you could also use Parallels Desktop or BootCamp.
Community Support thread here: http://pokemon3d.net/threads/1315/