The most major, and visible change is the regional dex. Platinum has (pre BW2, at least, haven't played those) the best regional dex, and that helps immensely on my opinion on the game. DP can't compare at all, it's a major change.
In my opinion, most of RS' problems are present in Emerald as well, and that's why I view it as a "worse" third version, since it doesn't fix the problems.
The same applies can apply to HGSS as well. Disappointing, actually, and that's coming from someone who thinks gen II is the best gen.
You might say if there's one thing I'm looking forward to with BW2, it's the regional dex. A lot of my other expectations were not met, so I think that's going to color a lot of my impression of the game, but the good part this time is that I have actually got someone to play the game with. Three actually, and that's bound to make it more enjoyable regardless.
Most relevant gif you'll see today
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Hello everyone? How are you guys?
Oh, hey, I'm quite late to respond XD Oh, and you have Black 2? I still have to get mine XD
Enjoy your Pokemon games :3
Of the two games, I'm planning to get White 2, since I played Black version. (Or at least given that the dex keeps most of the dex exclusives remain constant from B/W to their sequels.)
Yeah, have fun everybody :D
I'm going to get White 2 myself, when I go home for fall break on Thursday. I just like the version-exclusive Pokemon more than in Black 2 (except that Heracross is in Black 2 :< I might transfer one of those).
Oh hey Sunburn. How are you?
Hiya, I'm doing alright, I just woke up and I'm about to write a short essay before class. How are you?
I'm pretty good. Can't wait til 4:00 PM
Hey Keldeo ... enjoy the box!
What happens at 4?
Oh, nothing. I just get to talk to a friend of mine.