skarmory uses spikes 3 times. then roars. and roars. and roars. and roars. it kills tonnes of pokemon. then drill peck is there to finish one off. but if a pokemon like.. mr.mime came in, roar doesnt affect him due to soundproof. so that is where whirlwind is preferred. in which case, you need hp flying or aerial ace>drill peck, as whirlwind and drill peck is not possible to achieve on the same pokemon.
I Dun understand, why drill peck and roar what is the combo?
oOH i see, oh btw spikes hits everything, so you use the combo to torture the opponent pretty much?