The best replacement for soul silver is platinum.

The best alternatives to soul silver are rated as following:
★★★★★  platinum
★★★  heart gold
★★★  black 2
★★★  crystal
★★  seeker
★  heart gold pokemon
★  pokemon heart gold
  gold
  pokemon platinum

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

Other search terms related to soul silver and their ratings are:
★★★★★ pokewalker
poke walker
You have in mind a companion for soul silver and it is not yet here? Propose!



Google Trends

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soul silver
platinum
heart gold