You can only get it via Mystery gift. Though if you want, you can trade over Nintendo WFC. At the GTS.
Hope this helps!
I thought that only people who hacked could get Shaymin, well, unless you trade with someone who has, of course.
you can only do it on diamond,pearl,and platinum.
Dialga (Diamond Version) Palkia (Pearl Version) Uxie, Mesprit, Azelf Darkrai, Arceus, Shaymin
you cant only in a platinum event, but its over
Shaymin does not evolve in Pokemon Diamond.
in soul silver and hart gold go to goldernrod city go to the flower shop and have shaymin as your lead Pokemon and walk trough so shaymin apears out of the pokeball and the first person tells you it so cute it shaymin and then he gives you the gracidea flower then you can change it into sky form. from Little B
in the shaymin area you can mostly catch him at night..
you can get shaymin,jirachi,torterra(starter)
You have to trade Shaymin from a copy of Pearl or Diamond Version to Platinum Version then play through the game until you reach Floaroma Town when you get there have Shaymin first in your party then talk to the blonde hair girl and she will give you the Gracidea Flower.
the code that makes you walk through walls. i used to know it but action replay screwed up SO ya.
You go to route 224 at the end there will be a white rock and you need the oaks letter in order to get shaymin and a path will open and shaymin will be at the end.Unless you have the walkthrough anything code on AR.
As many as you can find I had a Sneasel Magikarp Geodude Shaymin and Seaking
In diamond you beat the elite 4 and Cynthia and then fly to the entrance of the elite four.Instead of going in to the elite 4 door,go right.You will find a long grass and flower path.ride your bike till you reatch the end.then you find shaymin.