It's about people doing stuff. And by people, I mean aliens. With magic. It's weird stuff. I don't like getting into the plot.
I'm playing Black. I breeded a team of dragon-types and sent the eggs over as soon as I could trade. Never done a mono-type team during the main game or started with a traded team, so it's a bit different. Admittedly dragons were a bit of a broken choice to start with since 4 out of 6 have Dragon Rage and thus could 1-hit KO everything for a little bit. Even now 40HP is over half and I'm in Nimbasa.