Poison types ftw. So many resistances. And while it's weakness are pretty common, it still only has two! That's quite awesome if you ask me. Now if only Gamefreak would give them some love in shape of a legendary that'd be great.
I always love dragon, because they have majority of the dragons i love. Also, most drakes are cool-looking. In terms of power, they pack some heavy punches too
Fire definitely, a lot of them have great type combinations that can make them really useful on battle and they usually have good attack, special attack or speed.
Fire. I <3 Fire. I need all shiny Fires. It was my first starter and I love it still. It seems pretty powerful against most of the NPCs in the game and double typed fires are fantastic for competitive