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We make up regi-like puzzles/dungeons for legendary Pokemon. (Maybe not quite as hard, but hard nonetheless.)
I'll start.
>Deoxys: A cave that you can access in the post game. Due to the power of all the Psychic Pokemon, gravity is changed in some of the rooms and you end up having to navigate around the ceiling and walls in order to get through it. The cave is hard to navigate as the game picks 10 of 25 rooms everytime you go in. You have to move floating rocks may block your path in order to advance. Some rooms may be blocked by larger rocks, in which case you'll have to take a longer road in order to advance. The cave is filled with extraterrestrial Pokemon.