It may seem like an odd and specific question, but I'm doing what's currently a Mono-water playthrough of my pokemon sapphire, and I'm thinking of training my Gyarados to level 25 so it can learn Dragon Rage, but I won't bother wasting my time doing that if the Magnemite has over 40 Hp.
Keep in mind, I'm asking about the Magnemite not the Magneton.