there is no region after sinnoh in Pokemon diamond and Pokemon pearl.
The Isshu Region.
there is no sinnoh region
You can't go to the sinnoh region.
You can only go to the Sinnoh region in the games Diamond, Pearl, and Platinum.
No there is no way to get to Sinnoh.
There is no sinnoh region in heartgold or soulsilver, it is only Johto and Kanto.
u cant leave the sinnoh region in diamond or pearl games
mossdeep is not in sinnoh
I think your talking about HeartGold/SoulSilver. In Pokemon HeartGold/SoulSilver you're not capable of going to the Sinnoh region, only Jhoto and Kanto are avaliable.
You cant.
A pokedex containing pokemon found in the Sinnoh region.
It has only the sinnoh region.