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Water routes having numerous non-swimmer trainers and the conservative additions to diving would be net pluses as well, even if I'm that one idiot who will forever insist that diving was a low-effort treasure trove waiting to be tapped.
The lack of viable fire types early on, depending on your feelings on Torkoal, wasn't fixed for faithfulness sake. But the three generations of mechanics and moves that inadvertently made the games easier also made like a dozen previously passable Pokemon more worthwhile.