You have to either go to an event for them (check the Pokemon main site often for event Pokemon), get them from someone who went to the events, or hack for them.
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I don't think you can. But if you buy an action replay then you can get codes to get Shaymin Darkrai any Pokemon you name you can get. I have 7 arceus 9 darkrai and 2 shaymin. You can get action replays from walmart target toysrus or something like that.
Arceus, Darkrai, and Shaymin P.S. in a new Pokemon (not out yet) Platinum, Shaymin Evolves. so does Giratina Can get REGIGIGAS and other event Pokemon like darkrai online at http://cgi.eBay.co.UK/ws/eBayISAPI.dll?ViewItem&item=140308748984 other event Pokemon on there aswell check the other items
A Pokemon event is where you can obtain special items like the azure flute(which you can use to summon arceus) and Pokemon like shaymin and darkrai. I never participated in one but i usually find advertisements on toys r us catalogs saying they offer rare Pokemon.
yes if you trade someone who trained it except. I dont think you can trade a rayquaza and kyogre or groudon ? hope i helped have fun trading i will trade arceus for mewtwo if you like the deal email me at darthmonkey73@hotmail.com
you should use it on a very hard legendary Pokemon like dialga palkia giratina shaymin or arceus