The only way to get these Pokémon onto Diamond/Pearl versions is to use the Pal Park to send them over from a Ruby/Sapphire/Emerald game.
Remember, Pal Park doesn't open up until after you beat the Elite Four AND get the National Pokédex by at least SEEING all 150 Pokémon in the Sinnoh region, then talking to Professor Rowan.
(NOTE: It does not include Manaphy, which is sometimes listed in online Sinnoh Pokédexes.)
You can also trade online for them and once you have all three you can go to a temple and get a fourth regi.
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