Go to Florama Town and talk to a lady after you catch Shaymin. She will rub something on Shaymin's head, and it will become Sky Form. It will return to its normal form at sunset.
that helps i'v been trying to do that all year!
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You can get Shaymin in sky form only in Pokemon Platinum Version.
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.
you could only get shaymin sky forme in Pokemon platnium in floromona town.
of course but only in sky
Actually just wait until night without shaymin holding the flower thing