Talk to the Hiker at Hearthome City and he'll give you a Shinx egg
You get it from Pokemon ranger. P.S. you have to beat Pokemon ranger first
you get the manaphy egg in Pokemon rangers and send it into Pokemon diamond or pearl
You get a togepi egg in Pokemon Platinum, not Diamond.
Have two Nintendo DS one have the Pokemon Ranger and one with the Pokemon Diamond. Then go to check egg. Then you have it.
Happiny
It is not possible to get a Lugia egg in Pokemon Diamond. It is generally impossible to get an egg of a Legendary Pokemon the only exceptions being Manaphy and Phione.
Manaphy is obtainable in Pokemon Diamond if you also have a copy of Pokemon Ranger. The game Pokemon Ranger is able to communicate with Pokemon versions; Diamond, Pearl, Platinum, HeartGold and SoulSilver to transfer a Manaphy Egg to them. This Egg can be hatched like any other Pokemon Egg.
If you mean Riolu, here's a tip: you can get an egg from Riley when you hit the Iron Island first time. When the egg hatches, you will get Riolu.
you cant unfourtanately
happiny
It's Happini.
You must breed a Monferno or Infernape with a Pokemon to get the chimchar egg.