Oh, you fell for that? Listen up, kiddo - that's about as fake as the Mew truck rumor from the original Pokemon games. It's an April Fools' joke, there is no such thing as a Guardian Key. But hey, if you want to try (and fail) for yourself, be my guest, although a quick Google search will prove that I'm correct. You can ride ON them, though! There's a video on YouTube by "nesis" showing you how!