Flail

The power of this move is 20 if X is 33 to 48, 40 if X is 17 to 32, 80 if X is 10 to 16, 100 if X is 5 to 9, 150 if X is 2 to 4, and 200 if X is 0 or 1, where X is equal to (user's current HP × 48 / user's maximum HP), rounded down.