You don't. You trade to Diamond/Pearl, you can't get it back. Unfortunately, you cannot get Manaphy back once you have transfered it to Pokemon Diamond or Pearl. You also can't obtain another one - you will find that both the password feature and the mission will not work the second time around.
Ranger net
To get a Manaphy in Pokemon Diamond you have to get Pokemon ranger and defeat it and you have to trade it to Pokemon Diamond,Platinum or Pearl.
no you already gave the manaphy egg away to your previous save
what are you on about you have to trade manaphy from Pokemon ranger
It's Manaphy, you can get it with Pokemon ranger. Do the special Manaphy mission and send over the Manaphy egg to pearl or diamond.
No idea, but you can get a Manaphy egg from Pokemon Ranger: Shadows of Almia and send it to Diamond as a Mystery Gift.
A Manaphy is not available in the wild in the Pokemon world. You must trade a Manaphy Egg from Pokemon Ranger.
You can not find or get manaphy on Pokemon diamond but you can by hacking, trading or... if you have Pokemon ranger you have to complete the manaphy mission and then you can put it onto diamond.
You have to get a manaphy from Pokemon ranger and breed it
To get manaphy, you have to have Pokemon ranger and another ds. You can transfer a manaphy egg from ranger through the ds's wireless abilities.
Manaphy is not originally in Pokemon Diamond. In order to obtain it (without an action replay) you must play all the way through the game Pokemon Ranger. In the last (extra) mission of the game you can acquire the manaphy egg and then send it over to Pokemon diamond.
It's not, it's on Pokemon Ranger, once the mission is complete, you can transfer a Manaphy Egg to Pearl or Diamond