1. Hold down the Shift key and do not let go (until noted).
2. Click on switches clockwise, until you've pressed about six switches. Six ensures you get every possible type of elemental combination. Because you're holding the Shift key, your character won't move yet.
3. Now do the same thing counterclockwise.
4. Now do the same thing with diagonals, in such a way that you always travel up when you're in a corner.
5. As #4, but traveling down.
6. As #4, but traveling right.
7. As #4, but traveling left.
8. Now you can finally release the Shift key.
This sets a character with roughly 40 waypoints to cover every possible combination of button presses. So you can then switch over to your other character and watch all the cool elemental effects until eventually the fight triggers.
I've rerolled my characters several times, and I've triggered both opponents multiple times, and I still have absolutely no idea what the actual solution to that puzzle is. I just input all possible inputs in an efficient manner.
