After paying Mr. Stick $100 he let you into the boss room, as you walk in you notice a lot of paintings about a large... humanoid belle pepper? Whatever you've seen weirder, soon you notice the same belle pepper painting a picture of you? But it looks horrendous (on purpose) Soon the pepper turns around and laughs loudly at you as you scream in shock

Pepperman: When I painted you that ugly it was supposed to be abstract...Yeesh...

Soon you begin the boss fight, Pepperman does some shoulder dashes, trying to slam you into the wall, he even does some jumps and tries to ground pound you