The best replacement for gengar is alakazam.

The best alternatives to gengar are rated as following:
★★★★★  alakazam
★★★★  dusknoir
★★★  haunter
★★★  nidorino
★★★  chandelure
★★★  mismagius
★★★  espeon
★★  aegislash
★★  gardevoir
★★  umbreon
★★  mewtwo
★  nidoking
★  zoroark
★  snorlax
★  banette
★  mega gengar
★  hypno
★  venusaur
★  reuniclus
★  alakazam pokemon x
★  lapras
  alakazam heartgold
  misdreavus
  mega alakazam
  spiritomb
  sableye
  haunter who's better
  alakazam soul silver
  scizor
  froslass
  greninja
  houndoom

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Google Trends

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gengar
alakazam
dusknoir