Shaymin in Sky Form

This is Shaymin Sky Form.If you want Shaymin Land Form to turn in to Shaymin Sky Form, you have to let your Shaymin Land Form smell or sense the same flower on Shaymin Land Form. This happened in the movie Giratina And The Sky Warrior. But however I do not know how to change Shaymin Land Form into Shaymin Sky Form in Pokemon games.