The answer to this varies. For example, if you have a Ditto and a Pikachu in the day-care, you will eventually get a Pichu.
Much like other Pokemon games in the past, there is a day-care center in a specific town (in the Sinnoh region, it is called Solaceon Town). If you put two Pokemon in the same egg group* together in the day-care, the old man outside of the day-care will turn to the side. When you talk to him, he will say that your Pokemon laid an egg.
When you have an empty slot in your party, you can then carry your egg. For the egg to hatch, you must travel a certain amount of steps (varied by the different Pokemon). Eventually, you will suddenly stop, and a chat box will open up, saying, "... Oh?" and your egg will hatch.
*Egg groups are groups in which certain Pokemon can breed with each other. Ditto can breed with any other Pokemon. However, most Pokemon are in specific egg groups. Legendaries can not breed.
Link to egg groups: http://pokemonplatinum-version.blogspot.com/2008/10/breeding-guide.html
you get it from an egg in Pokemon platinum
You can not get a Turtwig egg in Pokemon Platinum. But if you breed a Turtwig with a Ditto, then it is possible.
Im sorry, but there is no happiny egg in Pokemon platinum. You got diamond or pearl? trade from there
in an egg
you cant but when the egg hatches then you can trade hope this helped.
no you can't find a torchic egg in Pokemon platinum
you get it from an egg in Pokemon platinum
You can not get a Turtwig egg in Pokemon Platinum. But if you breed a Turtwig with a Ditto, then it is possible.
You have to have Pokemon ranger. If you do complete a special mission, and then obtain the egg, then you put platinum in a different ds, and connect them
Im sorry, but there is no happiny egg in Pokemon platinum. You got diamond or pearl? trade from there
Trade from Pokemon Ranger as an egg.
Use POKESAV to get an egg, and hatch it in Platinum
pokemon piatunum lugia egg code
From riley
riolu
in an egg
you have to do the mission in Pokemon rangers(manaphy egg mission)and trade it to your platinum you can get phione by breeding manaphy with ditto at the day care.(its not fair to have 2 games for just a Pokemon in platinum)