Battle Fantasia

You can get this trophy by playing the game outside Practice mode. The total damage you cause to others will accumulate over time. It’s a fair grind if you start from zero. Eventually you’ll get it. I recommend just playing through the story mode trophies (listed above), then, going in Arcade mode. You should have it by then. The trophy will pop up as soon as the game recognizes you have dealt 1,000,000 HP damage.