Heartome city
you get the manaphy egg in Pokemon rangers and send it into Pokemon diamond or pearl
Happiny
in hearthome city
There are no Shuppet eggs in Pokemon Diamond.
riolu
Talk to the Hiker at Hearthome City and he'll give you a Shinx egg
Happiny.
Talk to the daycare man. If he says your pokemon like each other, then they will probably have an egg.
you have to use the action replay to get it
Breed a Loudred and hatch the Egg
Cynthia does not give you an egg in Pokémon Diamond or Pearl, she gives an egg containing a Togepi in Pokémon Platinum after you have beaten Team Galactic in Eterna City
i think a dude gives to you when it is still a little egg.