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All of this, but specifically
>constantly needing to go through the HM cutscene on nearly every route
>that one route that required defog, and attempting to do it without defog locks you in 50 turn battles on a slow engine since everything keeps missing
>the route close to that with perma rain that again, makes battles take way longer
>the trek to the top of Mt. Coronet requiring nearly every HM in the game
>needing to backtrack to Hearthrome in DP
>the postgame volcano that's also HM heavy
>SAVING A LOT OF DATA