You put two Pokemon of opposite genders into the daycare. Or you can just put in a Ditto and the Pokemon you want an egg of. The egg will be the original Pokemon form (like from a Gyaridos you would get a Magikarp). Well, in most cases it will be the original, only with certain ones it won't, like with Snorlax, you get a Snorlax, not a Munchlax. Also, there are certain Pokemon you can't get eggs from, like legendary Pokemon.
Cynthia (Pokemon Champ) will give you the eggs every once in a while.
you trade eggs.
no. it is not possible, all eggs are the same except that they hold different pokemon.
There is no such code.
Breed a female starter
inside is 3 Pokemon eggs
Put it in the daycare with a ditto
From Barry if you are a girl and Dawn if you are a boy.
If you mean what Pokemon hatch from eggs, all of them, excluding legendaries. (Although Manaphy is an exception) Legend eggs can sometimes be hacked, though.
it is impossible except for when you have cheats in Pokemon pearl,platinum,diamond
it is not possible as legendary Pokemon are not breedable
you need one eevee and one ditto, then breed them and you will get eevee eggs.