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It would depend on what moves you teach them, their traits and evs. Personally I would say a dragon type or Sableye as Sableye has no weaknesses and dragons have very little weaknesses.
I heard it is shadow force.
The fifth gym leader is Fantina and she uses Ghost Pokemon. No element is strong against ghost except ghost, so just use your strongest Pokemon. But be careful - ghost to ghost is super powerful, but unless your ghost Pokemon is a much higher level than hers, do not use it since her attacks will be super effective against you. The best Pokemon to have are just a well-rounded team with most of the elements covered.
insidious
The best,strongest,and most powerful ghost
The most effective type on ghost type is ghost. Weird, huh?
Arceus
Caterpie
Arceus is the most powerful, with a base stat total of 720, the current highest. sds ooo
The most powerful water type is Suicune.
The strongest (most powerful) Pokemon is of course rayquaza.
Kyogre.