Turtwig, Chimchar, and Piplup.
Piplup,Chimchar,Turtwig
Turtwig. By far. It crushes another of the three staters with its types.
It evolves via level starting at level 16.
Croagunk will attempt to evolve starting at Level 37.
Ponyta evolves into Rapidash, starting at level 40.
There is no rental Pokemon in in Pokemon platinum
Omanyte evolves into Omastar starting at level 40.
sorry but you have to get another diamond/pearl/platinum game and trade the other starters from there.
You cant get Pokemon from Pokemon ranger to platinum!
how to get a togepi in Pokemon platinum
There is no grunt that you can give a Pokemon to in Pokemon platinum.
buy the Pokemon platinum book