Sinnoh is a region where more variety of Pokémon live. The starter Pokémon in this region are Piplup, Chimchar and Turtwig Better Pokémon and legendaries live here than hoen, kanto,and johto. Newest region ash is in in the t.v. series.In Pokémon diamond,pearl,and platinum your rival will be easy to beat with piplup as starter and teach it fly.
turtwig is grass and ground type
Piplup is water and flying type
chimchar fire and fighting type