Deoxys, nah Gengar or Dusclops, i'd say. Gengar the best, but u gotta trade for it, and you cant get it in all games. Dusclocs takes 2 pp instead of 1 for each and every attack made against it, also it can learn various moves.
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dark Pokemon are
You can use a good dark type pokemon like umbreon,hoondoom etc. I hope this help!! :-)
Fighting and depending on it's second type can be whatever
The fighting type is weak against Ghost and Dark Pokemon, so a Sableye would be good.
Dark-type pokemon are resistant to Dark and Ghost moves, and are unaffected by Psychic.