Well first you need a Shaymin of course. When you have it put Shaymin first in your party. Then you go to Goldenrod City and find the flower shop. As soon as you go in a girl will see that you a have a shaymin and will give you the flower that you need to transform shaymin to its sky form. After receiving it go to your adventure items and use it on shaymin. It will then change form. This will only work after you have obtain the national pokedex.
It only works in the daytime.
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Yes, you can get a Gracidea Flower in "Pokémon SoulSilver." In Soul Silver you have to go to Goldenrod City's flower shop (with traded Shaymin not Action Replay Shaymin) and talk to one of the sisters there.
Shaymin cannot be found in Soul Silver.
Shaymin cannot be legitimately obtained on Pokémon SoulSilver. It must be traded from Diamond, Pearl, or Platinum. To get Shaymin in Diamond, Pearl, and Platinum, you must either use an Action Replay or take advantage of an event.
The Gracidea flower wasn't an item in Diamond, and neither is Sky forme Shaymin, so sorry.
you must trade shaymin from flower paridise in Pokemon diamond or pearl to platinum. then, go to the blonde girl in the middle of floraroma town and talk to her with shaymin in the front of you party. then equip it to shaymin and you have shaymin sky forme!