>>130720461. Gen V
2. Best story by far in BW, best gameplay in BW2. Also great soundtrack and world building, they definitely make full use of the DS's capabilities.
3. There's a lot of great ones. Probably Scrafty overall, but Krookodile, Leavanny and Lilligant are also great.
4. BW had basically no postgame and a ridiculous level curve after the Elite Four.
5. Gen IV
6. Weavile
7. The Underground was really fun and useful. The Physical/Special split was a direly needed improvement. Basically, it greatly improved the series' foundation by perfecting mechanics and introducing development of setting and characters as a focus (unfortunately shortcomings were made in terms of Pokemon design and story, but this isn't the thread for that).
>>13072220Gen IV did actually flesh out characters pretty well in my opinion, it was the first gmae to show Gym Leaders having a life outside their gyms for one thing. Stuff like Maylene mentioning her father's gambling problem at the local Game Corner gave the game some heart.