I'm sorry but this post makes no sense to me. You say that "no one good uses Jolly" and then going on to say "risking Adamant while not scoring any significant 1-2HKOs isn't worth it." In the latter case you seem to be suggesting that Jolly is the preferred nature, contradicting your first point. :S
LOL I typo'd. I meant no one good uses Adamant <___< my bad.

