Definite Whitney, the Miltank was tough. Faulkner and Bugsy was easy for me. Morty was a challenge with the Gengar and Shadow Ball. Chuck was easy since he spams out using that Charging move (forgot it's name) and I will always hit it so it would be useless. Jasmine was very easy on SS (I had Typlosion by then) but I actually lost to her on HG (had a Bayleef). Pryce was basically easy cause ice doesn't resist anything except itself, making his Ground/Ice pig pokemon weak to all three starters. And Clair was a challenge in SS, but I defeated her first try. In HG, she was fun to battle.