Cynthia (Pokemon Champ) will give you the eggs every once in a while.
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There is no such code.
They are not found in the wild in Pokemon Platinum.
The only legendary that can be in an Egg is Phione, which you need to breed Manaphy with a Ditto. But other than that, you can't get any Legendary Eggs.
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Empoleon is not a legendary Pokemon. It is the final evolution of Piplup, one of the starter Pokemon in Pokemon Diamond, Pearl, and Platinum.