Hm... I dunno...
In Pearl I chose Chimchar... but I usually choose the fire starter (In Sapphire I chose Torchic, in FireRed, Charmander)
In Diamond I chose Piplup, BUT. **** came up and I didn't get to properly play with it... (in my second run on FR I chose Squirtile, and I did a quick run with Mudkip in Emerald..)
I don't really care much for Turtwig... but I dunno. xD (In Emerald I chose Treeko)
~~~
I really don't know. I DO have ALL the starters in Pearl, and really 4/5th of the Pokemon... so I can trade over an egg of pretty much anything I want to Platinum. =3 (I also have TWO DSes, so I can trade it over as soon as I'm able to get into the Pokemon Center in Sangem.)
Arg... @_@