First we should need a Golden Sun character, then a stage.
But if this is just for fun...
I had a little idea, it would be a bit like the new Ice Climbers stage, you start in the top of the Venus Light house, maybe in a certain moment, the Lighthouse gets light (for wathever reason) and a earthquake starts, maybe characters could get something like a DK down B effect, but with no damage, if it was like that at this point, aerial characters have more advantage. After the earthquake, the Light house splits and it starts to collapse, so you just have to jump down, now a brief moment (maybe for like 5-10seconds) there is a complete aerial fight, with no scenery, while characters are falling, then when they reach down, the camera moves (and you have to follow it like rainbow road) to the Light house wich for some misterious reason is completely intact, then you have to go up, following the camera, then you get to the top and the cycle repeats.