You get a Riulo egg if you help Riley he gives it to you after you beat the galactic grunts but be sure you have enough room for it in your team or you will have to come back for it. make sure you explore the whole cave because there are alot of items, one of which is TM23 iron tail. when you go through this Cave it would be wise to take lv 35, or higher, Pokemon with you. Most of the Pokemon you find there are rock and steel type so have grass,fire, and water types when you go thruogh here because the Wild Pokemon are Lv 30-35.
You can't/ you have to battle someone with it.
Riolu hatches by walking at least 6,400 steps. This can be halved by having a Pokemon with Flame Body as its ability in your Party.
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.
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.
Happiny
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.
you cant unfourtanately
happiny
It's Happini.
You must breed a Monferno or Infernape with a Pokemon to get the chimchar egg.