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We saw Spheal in the trailer. It's not in the regional dex but it can be found in postgame Platinum.
Anyway, I think it's fair to assume we will see gen 5+ Pokemon in the game. They stated in the trailer that this Sinnoh region has a different variety of Pokemon. I don't know why autists on /vp/ keep assuming they'll stick to the DP dex.
Expect Japanese-themed Pokemon like Golisopod for example.
