Manaphy= Pokemon ranger or WiFi events.
Darkrai= WiFi event
Shaymin= WiFi event
Arceus= The Movie or TRU
Only way to get em now is use AR or trade.
manaphee
A Pokemon adventure on Pokemon Diamond Verison can last forever if you wanted it to.
Arceus
-mongmong908
You have to trade them from older versions of Pokemon.
You can find out how many times you have beaten the Elite Four in Pokemon Diamond by checking your PC in the game.
the same pokemon they had last time
Garatina...
defeat the elite four
it is the elite four
The champion in the Elite Four.
Random.