YOU GET THE STARTER POKEMONS FROM THE BEGINNING!! JUST FOLLOW THE STORYLINE!!
starter Pokemon
Chimchar, piplup, and turtwig.
Pick him as your starter
Piplup
You can get another starter if you get all the sinnoh pokemon. Proffeser rowan will ofer a johto starter.
you get piplup as a starter in Pokemon diamond/pearl/platinum
pick it as your starter
Get action replay
Global Trade Station
It's a starter Pokemon from Professor Rowan in Sinnoh
you cant in platinum but you could trade from Diamond and Pearl or another Platinum.
Turtwig, Chimchar, and Piplup.