The battle system is still in the way of pikmin but the deals are a bit different. You still are on the same map and everything, but there are key notes.
HP (or hit points) are the enemie's health. Self explanatory, really.
The defence lower (Or DL) is what makes pikmin useful. The defence lower is the number for how much HP is taken from the enemy. Think of it like this:
(attack of the pikmin #) X (The DL) = Attack Damage
So if an pikmin's attack is 1 and the DL is 20 this would be the formula:
1 X 20 = 20 damage total.
Again, self explanatory.