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If you can get a Ferroseed ingame, then Stealth Rocks will run rampant, no doubt. If you can get Skarmory or Forretress, you'll still see pebbles in many places. Larvitar and Swinub also get them from breeding. I don't doubt that Ferrothorn, Forretress, Tyranitar, and Mamoswine will be OU next generation, though Skarmory is slipping. Of course, this is ignoring any new Pokemon they might add that can use Stealth Rocks, or the fact that there might actually be a Stealth Rock TM/Tutor.