What are the events for pokemon diamond/pearl?

Question

I need it for Shaymin, Darkrai and Arceus

Answer 1

Shaymin event has only occured in Japan with the release of the 11th movie back in July.

Arceus event hasn't come either.

The Darkrai event already passed. It was on May 31st and June 1st at Toys 'R Us....

Answer 2

both shaymin and arceus is unobtainable without cheating in pokemon D/P darkrai event is in japan

Answer 3

So far, the only events that have passed are the manaphy event, the deoxys event, and the darkrai event.  The shaymin and arceus events haven't come yet. =\ So for now, the only way to get shaymin/arceus/darkrai for you is by action replay or trading.