The best replacement for gardevoir is gallade.

The best alternatives to gardevoir are rated as following:
★★★★★  gallade
★★★★  alakazam
★★★  espeon
★★★  kadabra
★★  gengar
★★  sylveon
★  gallade emerald
★  florges
★  gallade x and y
★  mega gardevoir
★  meowstic
★  gallade platinum
★  metagross
★  claydol
★  alakazam emerald
★  blaziken
★  mawile
★  delphox
  alakazam pokemon x
  starmie
  gothitelle
  reuniclus
  xatu
  bronzong
  gallade pokemon platinum
  mr mime
  azelf
  lopunny
  gallade better
  grumpig
  gallade pokemon
  mewtwo

Your alternative for gardevoir is not listed? Suggest!
Speaking about gardevoir, one probably shouldn't forget about hyper voice.

Other search terms related to gardevoir and their ratings are:
★★★★★ hyper voice
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Google Trends

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gardevoir
gallade
alakazam