The best replacement for heart gold is soul silver.

The best alternatives to heart gold are rated as following:
★★★★★  soul silver
★  pokemon soul silver
★  soul silver pokemon
★  soul sliver
  pokemon platinum
  pokemon soul sliver

Your alternative for heart gold is not listed? Suggest!
Speaking about heart gold, one probably shouldn't forget about pokewalker.

Other search terms related to heart gold and their ratings are:
★★★★★ pokewalker
★★★ action replay
You have in mind a companion for heart gold and it is not yet here? Propose!



Google Trends

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heart gold
soul silver
pokemon soul silver