My favorites are:
1. Dragalge. An awesome typing and design, and with some good moves and terrifying power to boot.
2. Kingdra. Same reasons as Dragalge.
3. Mandibuzz. My favorite defensive Pokémon. It has an awesome design, great stats overall for a defensive Pokémon and good movepool.
4. Ho-Oh and Entei. My favorite legendaries. They aren't just awesome in Pokémon, but in Smash too.
5. Durant. Both my favorite Bug type and Steel type. It's very fast, and a terrifying sweeper.
6.Magcargo. A lava snail. How cool is that?