Suggested by Sonic Koga has some powerful poison type Pokemon but he’s also got some good variety with other types. When you mix them all together it is fair to say that Gemini Man would be overwhelmed by the sheer numbers here. He can’t blast them all at once and then they will be able to sneak up on him. His power is good but Gemini Man just doesn’t have the speed to deal with such an army. Koga wins.