My first game was Diamond. It probably explains why my favorite region is Sinnoh, because it was my first.
It broke, though, but I got a new one. In fact, I have about three Diamonds. I still love to play them.
My second game was Pearl(never finished), then Emerald(never finished), then FireRed(which I never finished), then Platinum, which is my FAVORITE, then some GBA games that I never finished, SoulSilver which I am in the process of, then White, then Black.
I still love Sinnoh overall.