The best replacement for rotom is luxray.

The best alternatives to rotom are rated as following:
★★★★★  luxray
★★★★  ampharos
★★★★  shinx
★★★  magnezone
★★★  electivire
★★★  eelektross
★★  spiritomb
★★  dusknoir
★★  froslass
★★  luxio
★  zapdos
★  porygon
★  lanturn
★  professor oak
★  eevee
  drifloon
  mismagius

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Speaking about rotom, one probably shouldn't forget about rotom.

Other search terms related to rotom and their ratings are:
★★★★★ rotom
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rotom
luxray
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