Get the Gracieda from a Beauty in FLoroma Town near the house in the center of the town and she will give you Gracieda and then use it on Shaymin and Viola it works.
P.S. this only works in Platinum
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trade it to platinum to get its sky forme, and back to DP to get its land form
It changes back to Land Form at Nighttime and It goes into Sky Form in the Daytime. If you don't want Sky Forme at all then start over without a Gracidea Flower.
by the way you spelt shaimin rong it shaymin. go to event to get it on diamond or pearl then trade it to platinum. to get sky form (on platinum) go to floroma. talk to woman with blonde hair. she giv u gracidea. use this on shamin during the day and he change form. shaymins only sky form during the day and turns normal at nite. use gracidea again on shaymin the following day he become sky form again!
You can't change Shaymin into Sky Form in Pokemon Diamond (that includes pearl). You can only change Shaymin into Sky Form in Pokemon Platinum (that includes Heart Gold and Soul Silver). You can get the Gracidea to change Shaymin into Sky Form.
Actually just wait until night without shaymin holding the flower thing