Turtwig-Probably the best starter. Really high Attack and Deffense, but kind of slow. Learns really good moves like Razor Leaf and Bite.
Piplup-Has very decent stats. Attack and Deffense are the same and Special Attack is the best stat, but does not learn any good moves. My Prinplup knows Pound, Metal Claw, Bubble, and Peck and these are the only attack moves it learns up to level 22.
Chimchar-Decent attack and good Special attack. Fairly fast, but weak deffense. I had and infernape and didn't use it and turns out that was my most successful file.