Yep
A way to complete your sinnoh dex is to battle every trainer, Nintendo made it so if you battle every trainer you will complete your sinnoh dex.
Yes.
You need to have the national dex along with shaymin
Complete the sinnoh dex
simple really... find every Pokemon and then move on to your master dex.
I don't know if there is a code. But you can complete de Dex by seeing all Pokemon in platinum. All Sinnoh-dex Pokemon can be found ingame.?
Complete sinnoh dex
complete the sinnoh dex and there
Catch all the Pokemon in the game
Yes There Is.
yes and to do so just see all the Pokemon in sinnoh to complete the sinnoh dex
Finneon is 134 in Sinnoh Dex