Through the Art of Fire Bending. Bloo shows his deviant nature by burning the Clothes of Gym Leader Flannery (Pokemon Omega Ruby & Alpha Sapphire), Vambre Warrior (Mighty Magiswords) and Carissa (Lolirock). Good thing Kam-Kam wasn;t here this time, otherwise he would've had a major nosebleed.
When Those girls manage to get some new clothes, Bloo is going to be in serious trouble!