The mission for manaphy is unlocked as such. When you unlock ranger net, you have one choice to go to on the first screen. If you hold left, l, r, x, a, and y(correct me if im wrong!)you will unlock a thing called enter a password. Here you can enter a password and if it is the right one, you will presumably unlock the mission for manaphys egg. You then get another title at the first screen where you can look at the egg and choose to send it over to diamond or pearl via wifi. It has not been 100% confirmed by it is presumed, bout 90 % chance. It has also been said that the code will be revealed or givin a hint on the 15th of december, next friday. Noone has got it yet. this is for the american and european versions