Use a Gracidea flower on Shymin
You need the item called Gracidea.
Even if you trade shaymin sky form it won't exist in your pokedex and you can't get the Gracidea Flower item. Sorry!
to changeshaymin between land and sky form you have to trade it to platinum that comes out march 23rd and go to floraroma town and have shaymin in your party,a woman will give you a gracadia,gracadia is a key item so you can use it more than once, give the gracadia to shaymin and it will change form
trade it to platnium
Shaymin's sky form is a form that the Pokemon character Shaymin can take.
No, because the item that makes shaymin sky forme is a key item, and key items are untradable.
skymin
You can get Shaymin in sky form only in Pokemon Platinum Version.
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.
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.
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!
no you can't but when Pokemon platinum comes out on march 22nd sky form shaymin is on their