He is huge. As you’ll find out, you cannot hurt him at first. Try to destroy the things around him on the ground. Eventually Doctor Pocacchio comes by and throws Jaster the Barrier Break Shot. Shoot Johnny with it and start doing damage. Soon enough you’ll have him defeated. Or so you thought. He turns into Johnny DX. He is now on fire. Use the same strategy (Flash Sword 2) and pummel him, but be more wary of his attacks as they are more powerful. You get a Space Compressor and Moebius Battery for winning.