Ok, this is how to make Acid Ace battle cards do more damage.
For Mega class card Acid Ace, Acid Ace V2, Acid Ace V3, or Acid Ace X, Acid Ace will lock on to an enemy and slash them once. Well, right when he slashes, press A and down at the same time and he'll slash again doing the same amount of damage! It takes some practice.

And for Giga Class card Wing Blade, as soon as you press A to activate it, press R R L or L R R. R L L does a lockon laser shot and then uses wing blade. Always use R R L. If you time it right you will here a ding!