Originally Posted by Cogwheel
Also, I used Master Spark once. Then got disappointed and never used it again. Am I missing something?
It's all about the timing. If you can get it off without Marisa being damaged beforehand, it stands to take nearly 50% of every enemy's max HP when it goes off. In this battle, for example, it killed both enemies when it fired, doing 100+ to each (the game doesn't track overkill damage, as you know). It has the potential to be an extremely strong weapon. However, use it at the wrong moment, and you basically lose Marisa for the rest of the battle. It's important to know when using it will result in a smashing victory, and when it will just severely drain your battle counter and cause you to lose a member.