Do you mean gracadia flower? Cause there's no such thing in Pokemon Platinum called a gilice flower. If so all you have to do is get a "Shaymin" and go to Floaroma Town, there's a blonde hair girl standing near the sign to the right of the Pokemon center, then you just talk to her and she'll give u a gracadia flower "in Your key item bag" (it is used to make "Shaymin" transform into His\her's "Sky Form")
Answered By:Shakein
the gracidea flower
you can't you can only get it on Pokemon platinum
This is a rumor of how to get it.
Nintendo event
talk to the lady near the honey man and you get a flower
route 224. {flower paridise}
Somewhere in floaroma town
You can't. It is specific to Platinum.
North of the Pokemon league (Take the seabreak path)
Flower Paradise (requires Oak's Letter)
YesYou Can Get Shaymin Sky Form In Pokemon Platinum With A Cheat Code That Is A Special Flower.
type in wikianswers how to get gracidea flower in platinum its the same in pearl to