I conveniently find Riley, whose Lucario senses the location of Shaymin. Then my Sandshrew digs to your location, steals Shaymin,and Sandshrew comes back to me with Shaymin. Then I send Shaymin to a Pokewalker synched to my SS and only my SS, then I hide the Pokewalker in a safe no-one can break through,and then I lock the game card in another safe impossible to break through, and then I use my Abra to Teleport the safes to a planet impossible to get to. How are you gonna get Shaymin now?!?!?
PS: Be crazy with your ideas!!!