Yes,By Trading pokemon.
Pick Piplup or Chimchar and then trade for a piplup or chimchar
You can only get one of these starters in Pokemon platinum: piplup, chimchar, or turtwig. In my opinion it is best to get piplup for type advantage. Example: if you get chimchar your friend (on the game) will get piplup, and chimchar is fire so piplup will win because it is water. Same thing with turtwig, he will get chimchar and grass is weak against fire. But with piplup, piplups only weakness is electricity and niether chimchar, or turtwig is electricity so piplup is your best bet.There is a cheat to get all three of them but I don't know it so the only way you can get piplup if you already have chimchar is to trade with someone who has piplup.
Turtwig (grass) Chimchar (fire) Piplup (water)
No. The starters are still : piplup, chimchar and turtwig.
Piplup is stronger, cuter and more loyal than turtwig and chimchar! For example, Piplup, the penguin Pokemon can use water type attacks on chimchar, and ice type moves on turtwig!
in order from best starter to worse Piplup Turtwig Chimchar
out of piplup, chimchar and tutwig it would be PIPLUP! Piplup ca use water moves on chimchar, and ice moves on turtwig. the second is turtwig and third is chimchar. (I chose piplup and now it's a strong lv 100 Empoleon now!) PS: "Give it a try!"
no, you are stuck with piplup
You get prinplup when piplup evolves. To get piplup you either pick chimchar, turtwig, or piplup.
still the same Pokemon as d/p chimchar, piplup, and turtwig
if you choose turtwig as your starter than your opponent will have chimchar if you chose piplup then your opponent will have turtwig and if you chose chimchar than your opponent will have piplup.
in the begining of the game If you want a piplup and a turtwig or chimchar I suggest trading.