The best replacement for dialga is palkia.

The best alternatives to dialga are rated as following:
★★★★★  palkia
★★★  giratina
★★  arceus
★★  rayquaza
★★  zekrom
★  mewtwo
★  palkia movie
★  lugia
★  deoxys
★  reshiram
★  palka
★  kyurem
★  groudon
  xerneas
  darkrai
  celebi

Your alternative for dialga is not listed? Suggest!
Speaking about dialga, one probably shouldn't forget about palkia.

Other search terms related to dialga and their ratings are:
★★★★★ palkia
You have in mind a companion for dialga and it is not yet here? Propose!



Google Trends

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dialga
palkia
giratina