I don't want to stay on mine for long since it aas quite embarrassing, but in black 1 I couldn't beat the electric gym leader Elesa(I forgot her name but she sucks anyway :< )for weeks! It was just impossible to beat the volt switch spam between 2 emolgas and since I chose serperior as a starter and skipped palpitoad as a capture all of my pokemon kept losing to volt switch. Yeah I could keep attacking the emolga's, but zebstrika would sweep me in the end. Me being the noob I was didn't know typings exactly or what non attack moves did so to make matters worse I would never be able to come up with some strategy vs the flying squirrels. Luckily on some miracle she switched into zebstrika randomly and I killed it right as it came in and from there I kept attacking the emolga's and I finally won after forever!