It depends. For example, I can't choose with Generation 1 as all of them are epic, in Gen 2, I chose Typhloshin, In Gen 3 I couldn't choose because Blaziken, Sceptile and Swampert are all epic, I chose Turtwig in Gen 4 and kept it at a Grotle, luckily it was female, bred it with another pokemon, made lots of Turtwig off-springs and traded them for Piplup and Chimchar. As for Gen 5, I got an Oshawott. I loved it dearly, but I got a Servine by the time I was in Castelia City. The reason I decided to get Servine later is because Servine would be perfect for competitive battling, especially with the epic Contrary ability, high speed, EV's and Leaf Storm. (Boosts SP Atk, doesn't lower
) it could kick some serious butt. Oshawott stayed and now I am in the fourth gym. I tend to do Grass Types, or fire types, sometimes water type starters.