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Deals damage and has a critical hit rate one stage higher than normal. Assuming there are no other critical hit modifiers in play, this move has a 1/8 chance to get a critical hit instead of a 1/16 chance.
Attack Order is the perhaps the best physical Bug-type move out there, competing only with Megahorn, but unfortunately only Vespiquen and Smeargle are capable of using it; the former is highly uncommon and the latter has appalling stats and many better things to do. Conclusion: if for some reason you decide to use Vespiquen, use Attack Order.
X-Scissor is a less powerful but more widely distributed move with no added effect.
Megahorn is a much more powerful but less accurate move with no added effect.