Just the first three, really --- Violet, Azalea, and Goldenrod. I suppose it's a bit unfair to dismiss them when I've only challenged the easiest ones, but I don't see them getting much harder until I've beaten the first eight.
...thinking about it, I wonder if Falkner's at all challenging if you go through Kanto first... well, perhaps they'll accept challenges after you get both sets regardless of which set you went through first.
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...thinking about it, I wonder if Falkner's at all challenging if you go through Kanto first... well, perhaps they'll accept challenges after you get both sets regardless of which set you went through first.