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Go to Serebii, check Piplup's info, at the bottom will be egg moves, teach those to Empoleon, breed it, and the baby will have egg moves. But only males can give egg moves, if you have a ditto you're fine.
First off, this is in the wrong section. 2nd..in order to get egg moves on piplup you must first have a female piplup. Then get a male of the pokemon who has the egg move AND is in the same egg group as piplup. If you just want to pass moves from an empoleon, just use a ditto.