The starter pokemon for Diamond and Pearl are Turtwig, Piplup, and Chimchar.
what starter? you already get a starter after you beated red.-_-
Chimchar
Choose it as your Starter Pokemon.
You have to choose it as a starter
You have to trade it from another Pokemon Pearl, Diamond or Platinum game, or use cheats.
I'm pretty sure that the only way to get another starter Pokemon in Pokemon diamond is to go to the Global Trade Station (GTS) and trade with someone.
You can only get another starter by trading with another game in the same generation.
Trade with another Pearl or Diamond.
The starter pokemon for Diamond and Pearl are Turtwig, Piplup, and Chimchar.
Cyndaquil is the Fire type starter Pokemon from the second generation. It does not occur in the wild or as a reward in Pokemon Diamond, and must be traded over from another game.
what starter? you already get a starter after you beated red.-_-
Chimchar
You can't change it after you already got the starter. You would have to start a new game to get a different one.
piplup
you can get it as your starter Pokemon
Choose it as your Starter Pokemon.