There is a trainer near the entrance of Eterna Forest one of those camping-like girl she has a piplup.
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pick it as your starter
Usually at target you can find a piplup doll in the Pokemon section. If you are asking 'Where can you find a Piplup in the Pokemon game?' you need the ds games Pokemon Diamond, Pokemon Pearl, or Platinum.
No, you have to trade with diamond, platinum or pearl.
Turtwig Chimchar Piplup
Get it as a starter in diamond, pearl and platinum