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For me the Poketch and underground mining was a lot of the fun for DPP. In HGSS I think they had a very solid basis by using GSC and just having to create the game with the new tools of gen 4. They also added little things like the arceus event to give birth to Giratina, Dialga, or Palkia. I really thing HGSS needed the Sevii Islands or Orange Islands to make it feel complete.