Give it a Gracidea (a flower) to hold and itll change from 5am - 8pm.
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.
There is no evolution. But you can change its form into a skaymin. (Sky Shaymin)
You can't. Shaymin Sky Forme is a post-Diamond and Pearl Exclusive.
A Shaymin in Shaymin Village gives you a Gracidea. Use that while in a dungeon and he will change form.
Shaymin's sky form is a form that the Pokemon character Shaymin can take.
There is no cheat you just need to catch shaymin using Oak's letter then the lady in floroma town will give you the key item Gracidea Flower and you can give to Shaymin and it will change form.
Actually just wait until night without shaymin holding the flower thing
You can get Shaymin in sky form only in Pokemon Platinum Version.
skymin
It isn't the evolved form of shaymin it is the same Pokemon. To get it you trade your ordinary land form shaymin to Pokemon platinum and it changes into sky form. Only problem is Pokemon platinum dosent come out in England until next December. Hope this helps.
trade it to platnium
get a Gracidea in the shaymin village in a dungeon use the Gracidea on shaymin + shaymin is in sky form effect removes if your at the next floor and sky shaymin sky forme is on double speed in Pokemon diamond,pearl&platinuam you get an gracidea,go to the Pokemon league then,there!