You need to have Shaymin in your party while doing this. It only works if the Shaymin was given in an event or you used Oak's Letter to catch Shaymin in it's natural habitat in Flower Paradise so if you just hack it off using a cheating device, it won't work. As soon as you have Shaymin, go to Floaroma Town and talk to the girl near the sign. She will give you a Gradicea Flower. The flower is used to turn Shaymin into Sky Forme without trading it into Pokemon Platnum when you use it on Shaymin. And since it's a key item, you can turn it back it into Land Forme if you want to.
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that kind of flower is not available in diamond cuz Shaymin gets new form only in Platinum
You don't give it to shaymin, you use it on him. When you use it, your game takes you to the party screen like if you used a potion. You then choose Shaymin and it will transform. Also, he changes back at night no matter what, but you can just use it on him again when its daytime. Electriranger- Don't forget that the Gradicea flower is in the Key items pocket, so you can use it over and over again. It also transforms when it's asleep and when you put it in the PC box. THIS IS JUST A COMMENT : WHOEVER DID THE ABOVE DID IT PERFECTLY O O \__/ Silver*: Psh you got that right lol ^^ TY for the answer.
sun flower
The flower shop is at the right of the gym in goldenrod
A flower that starts with SH is the Shasta daisy.