To do this secret you will need a Deoxys (you can get him via a trade or off wi-fi)put Deoxys first in your party and go to Vielstone city south of the city there are 4 metior's each metior changes Deoxys form to either attack,defence,speed and normal form and i will now say which is which. TOP:Speed the one below speed is:normal and at the bottom left:defence and right:attack (defence and attack are in same crater)