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I feel like I'm conforming to this huge bunch, buuut...
I love Gengar so much. It's really reliable and quite strong. Overall it's my favorite ghost type pokemon <3
Sableye. I had one that I named Akio. XD I loved it...
My second favorite would have to be Litwick. It's so cute. XD
I like Ghastly :)
Gengar and Sableye. :3
haunter. I raised a gastly and it evolved and now haunter is my favorite ghost type
Hm... That's tough. Probably Gengar or Spiritomb. Spiritomb is awesome if you teach it hypnosis and dream eater. Best combo ever :)
Gengar. ^-^ My brother traded me his haunter when was a kid, and of course it evolved, and gengar was basically my favorite pokemon all time after that, three immunities made it very easy to battle with. :3
My Gangar saved my sorry ass when I fought a few gym-leaders and the PokÃ©mon league.
Sableye is my favorite! This Pokemon helped me beat Brawly in Pokemon Emerald. >:D