Everyone is saying once you get the flower from the lady in floaroma town you just give it to your 11th movie shaymin. Well theres something more to it. You can only get the shaymin in sky forme between the times of 4.oopm until 8.oopm. you must also make sure that when you give the grecidea flower to your shaymin that it is in the first pokemon slot, and that it isnt holding anything.You can only give it to it if you go into your pokemon and click to give it an item and then go to the grecidea flower, not go to the grecidea flower first and try, because it will say the grecidea flower cannot be hold. it does work the other way around though. Have fun, hope it helped a bit more if you were puzzled over why it may not of bin working.