Yes you can get a piplup egg by your piplup, prinplup, or Empoleon if you find the same pokemon that has a Water 1/ Field like golduck, buizel, or floatzel, then put them in the daycare Center leave there for awhile then come back later to see if theres an egg ask the old man outside the daycare. Or after you beat the champion, you can migrate a ditto off of your other games to have a piplup egg. -Sasuke56