Breed your piplup with a ditto. Or breed a femle piplup with another Pokemon from the same egg group as piplup.
Turtwig (grass) Chimchar (fire) Piplup (water)
You cant get a piplup mask on Pokemon Diamond or Pearl u can get it but i don't know how
If you are talking about the games, Piplup was introduced in Pokemon Diamond and Pearl... Piplup was introduced in the anime Pokemon Diamond and Pearl episode 1, titled "Following a Maiden's Voyage!"
Piplup is obtained as a starter in Diamond and Pearl or through trades.
Piplup is a starter Pokemon if you didn't choose it have a friend trade you it.
Piplup evolves at lv. 16
piplup
Choose it as your Starter Pokemon.
The starter pokemon for Diamond and Pearl are Turtwig, Piplup, and Chimchar.
they are chimchar, piplup and turtwig
you get piplup as a starter in Pokemon diamond/pearl/platinum
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.