-( Story related, cannot be missed )-
You'll face Sweet-P in the depths of Papiko after acquiring the three passage tokens (handkerchiefs from the Flower Princesses) and entering the Women's Area. She'll be armed with a bow like Kotono so shooting is going to be more of her thing, though she doesn't have many options to counter. As with before, your better chances are to grind around the area prior to meeting her to meet her level, or to play on Battle Difficulty: Easy.