you cant but when the egg hatches then you can trade hope this helped.
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There is no trainer in Pokemon Platinum with a Manaphy. However, you can trade with someone who has a Manaphy, or complete the special Ranger mission in Pokemon Ranger and transfer the Manaphy egg over to Pokemon Diamond, Pearl, or Platinum.
you get it from an egg in Pokemon platinum
Normal egg groups, same as Diamond, Pearl, Platinum, HeartGold, and SoulSilver.
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