How much are Eruption/Water Spout weakened for each amount of health?

Question

How much does their base power lower with each % of HP?

Answer 1

Their base power is 150 and it decreases based on your percentage of HP remaining.

So with full HP it's power is 150. With half HP it's 75. With 1% HP remaining it would be 1.5 (or 2 if it gets rounded, I'm not sure).

Answer 2

Well, if you have 150 hp, then if you lose 40, it's power level will be 110 but I don't know the exact calculation

Answer 3

well there's no telling for how much this moves will decrease if your hp is decreased, so in my opinion use this moves in the start before your attacked by your enemy and strengthen your defense with moves like harden etc.

well of course this is what i think so i think you should just go with what you think is right