>>717199012
I love gen 5 to death, but the only thing that Challenge Mode did was just make every trainer pokemon have ~4+ more levels.
They didn't actually adjust the stats accordingly, so for instance a lv 53 would have the stats of a lv 49. This, in turn, made the game easier because of the new gen 5 XP scaling. The enemy levels were purely cosmetic outside of giving your pokemon more XP.
I feel like the difficulties were just included as a little "wow cool infrared" novelty and nothing else. And it was a cool novelty, just not very playable; not to mention that your average layman would have to delete his save file if he wanted to play it.