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4th gen really could of added a few more of its own pokemon rather then the huge influx of evo's. I actually enjoy a lot of the Evo's older gen mons got, but it did make the dex feel a lot smaller then what it actually what.
I think a new zubat and a new Geodude would of been much more effective for this generation. I love me some Crobat and Golem, but geez man, we already had 3 generations of getting swarmed by the bats and rocks, it would of been nice for something new to mix it up.
Outside of a lack of fire types and a slow engine, I actually remember Diamond and Pearl much more fondly. Prehapes even more then I actually enjoyed them when they first came out.
It was the gen that got me back into pokemon, and the Physical/Special split was just dying to happen.
I personally have a bias towards enjoying gen 5 myself, but gen 4 is pretty much right up there with it.