You CANT but you could get the gracidia flower.Talk to the lady in flamora town if you have shaymin in your party she gives you the flower then use it on shaymin and it will turn to sky forme.ps dont trade the shaymin from a diamond or pearl game and try to get the flower i tryed and it didnt work.
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Shaymin cannot evolve.
You must have shaymin in your party, and this must be Pokemon platinum, if you have it in your party then she will show up and talk to her to get the glaceada or something flower
how to evolve golbat in platinum.. how to evolve Scyther in platinum. how to evolve electabuzz in platinum. how to evolve magmar in platinum.
You can get Shaymin in sky form only in Pokemon Platinum Version.
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!