Pokemon games always seem to come in threes. They first relsease two games that are slightly different to each other. And then they release a second where they merge the the pervious two and add a few ajust ments. This is not the 5th generation of Pokemon games, its more like the 4.5th generation. Here are the only changes:
The battle fontier is back
A few pokemon are now in the sinnoh dex so you don't have to wait untill you get the national dex
A slightly different storyline
The gyms are in a different order to make things easyier
So its not that much different. Its a improvment, but at the same time a disapiontment. 9/10