Favorite Pokémon? Hm. Mine would probably have to be Gastly. Once I get the Sliph Scope, it's Gastly hunting time! I would give Gastly the most attention after that point. I would wait until it evolves into Haunter, train it to around level 50, and then trade it so that it would become a Gengar. Then, it's all-out pwning and awesomeness.