^Here's a question though. Why settle for burning ageislash when you could just use prankster destiny bond to KO?
As for sucker punch, it is a matter of preference, but having messed around with mons that had to rely on sucker punch in the past, I vastly prefer the more reliable option of shadow sneak in exchange for the effective 20 BP.
As for sub-set up, that might be effective in lower tiers, but I don't think many OU mons are slower than banette's 65 beyond the ones that are simply slower than everyone, like ferrothorn. Scizor can at best speed tie, but does have bullet punch. If someone does calcs to see how much damage scizor bullet punch does to regular/mega banette, then you have options. but as is, I don't see the value of substitues, even priority ones, on a mon like megabanette.
As for sucker punch, it is a matter of preference, but having messed around with mons that had to rely on sucker punch in the past, I vastly prefer the more reliable option of shadow sneak in exchange for the effective 20 BP.
As for sub-set up, that might be effective in lower tiers, but I don't think many OU mons are slower than banette's 65 beyond the ones that are simply slower than everyone, like ferrothorn. Scizor can at best speed tie, but does have bullet punch. If someone does calcs to see how much damage scizor bullet punch does to regular/mega banette, then you have options. but as is, I don't see the value of substitues, even priority ones, on a mon like megabanette.