The best replacement for reshiram is zekrom.

The best alternatives to reshiram are rated as following:
★★★★★  zekrom
★★  dialga
★★  kyurem
★★  zekrom which is better
★★  xerneas
★  yveltal
★  ho oh
★  arceus
★  charizard x
★  kyurem w
★  zekrom better
★  zekrom stronger
★  charizard
★  zekrom video
★  lugia
★  zekrom movie
  palkia
  white kyurem
  rayquaza
  zekrom youtube

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Speaking about reshiram, one probably shouldn't forget about kyurem.

Other search terms related to reshiram and their ratings are:
★★★★★ kyurem
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