Yes, Shaymin is an event Pokemon.
In order to retrieve it you must have Mystery Gift and Wi-fi.
You download Oak's Letter on mystery gift from September 28, 2009 to November 1st, 2009. After this is over you will no longer able to get Shaymin legally.
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You can't get the Miracle Berry without the Shamin event.
If you have Shamin in your party go to floaroma town and in the middle of the town there is a girl talk to her and she gives it to you.
if u mean shaymin u need TR U event ar AR or normal event.TRU=toys 'r us store or ive u have 2 ds and diamond and platinum tweak on diamond.
You can only get Arceus by an Event.
Flower Elysim is the same as Flower Paridise where you get a Shamin after you go on route 224, which you have to have 492 Pokemon in your pokedex or, just go to an Nintendo Event.