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In order to get Spiritomb in DPPT, you have to place the Odd Keystone in this hole and then talk with people 32 times in the underground
And to get it in HGSS, you need 100,000 watts in the Pokewalker to unlock the Quiet Cave, and then having to take another 10,000 steps
Found some really good stuff on the Super Metroid speedrun wiki last night