Lugia is a legendary pokemon, therefore it does not have eggs.
If you want a Lugia egg, first get the actual one. Then get a Ditto and put the actual Lugia and the Ditto in the day care (located south of Goldenrod City). Wait for them to have an egg and you'll have a Lugia egg.
You cannot make Lugia egg because Lugia is a legendary Pokémon.
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Ditto and Lugia do not breed. I tried it.
No. You can't get a Lugia egg unless you use a cheating device like an action replay.
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.
Lugia is a legendary Pokemon and from the No-Egg group, therefore, it cannot breed.
You find a cor. orb or buy one in the backroom Easy Edit: No. This person asked HOW to corrupt an Egg on Gpxplus. Not how to get a Corruption Orb. You corrupt an Egg by using it on one of these Egg's: Bidofo Egg, Groudon Egg, Lugia Egg, and Dialga Egg.
how to find lugia and ho-oh
It is not possible to do.
You can't unless you use gameshark
You cannot find Lugia in Pokémon Platinum.