Poison or burn them, confuse them, use leech seed, force them to switch out with whirlwind or roar, even raise your own attack to +6.I guess really defensive Pokemon that sit there and are like hurr hurr +6 in both defenses wut u gon do nao.
Basically anything in B/W that has Study... SO ANNOYING! And Obviously Zubats, Geodudes, Rattatas, Pidgeys, all that lot...
Ugh, a lot of Pokemon, really. ;-; Pokemon with only 1 weakness, i.e Scizor, Forretress, Swampert, Quagsire and Gastrodon (There are more, but they're the main ones) I find during In-game plays that Bronzong, Bronzor, Skuntank, Drapion (Yes, Sinnoh annoys me so much!) I guess really defensive Pokemon that sit there and are like hurr hurr +6 in both defenses wut u gon do nao.