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Water and caves are both pretty bad without repels, but I think I hate the water a little bit more. At least in caves you get to do a little more exploring, but then you get open water places like Hoenn, where it seems to take forever to get to where you're going. Its even worse when you forget...
Blue, Red and Cynthia stood out to me the most, so I voted for them. I have to vote for the originals, and since Cynthia in Platinum is the toughest champion that I can ever remember battling, she gets a vote too.