Once I defeated Will, I healed my Pokemon in order to be ready for the next battle. I headed off to Koga's room after that, and I talked to him. We began to battle immediately, and he sent out his Ariados. I sent out my Fearow, and I used Aerial Ace against Ariados. That was enough to defeat it, and then I sent out my Ampharos to battle against Koga's Crobat. I won that battle with a critical hit ThunderPunch attack, and then I had to face off against Koga's Forretress. I used my Typhlosion against it, and I defeated Forretress with Flamethrower. I had to battle against Koga's Muk after that, but Golem's Earthquake attack was enough to defeat it. All that was left was Koga's Venomoth, but I used Mamoswine's Ancientpower attack to defeat it easily. I defeated Koga, and then I saved before moving on to the next room.