How do you get all Pokemon without a event?

I've looked for how to get Pokemon without events, but I'm 100% sure that you can only get Pokemon like Shaymin, Darkrai and Arceus is with an event OR with an AR ( Action Replay) or an R4, which is selling quite cheaply for $28. Hope I helped ----Wolf_boy_Tsukuyomi_ ^_^
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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