>>25248312And while AkyuuD isn't entirely safe to use against Dark-type focus attackers (and certainly not against spread attackers), here's how she fares against Extra Lily.
252+ Atk Good Ring darkened LilyE Panic Call (97.5 BP) vs. 252 HP / 252+ Def AkyuuD: 123-145 (73.6 - 86.8%) -- guaranteed 2HKO after Leftovers recovery
252+ Atk Good Ring darkened LilyE Panic Call vs. 252 HP / 252+ Def AkyuuD: 82-97 (49.1 - 58%) -- 96.9% chance to 2HKO
252+ Atk Good Ring darkened LilyE Full Burst Detonate vs. 252 HP / 252+ Def AkyuuD: 75-89 (44.9 - 53.2%) -- 0.4% chance to 2HKO after Leftovers recovery
252+ Atk Good Ring darkened LilyE Dark Arrow vs. 252 HP / 252+ Def AkyuuD: 127-150 (76 - 89.8%) -- guaranteed 2HKO after Leftovers recovery
Note that's LilyE using Good Ring: a 145 base focus attack Sound/Dark-type boosted by Choice Band and STAB can only win against AkyuuD if she uses Dark Arrow, because anything else will get whittled away by burn damage.
If she doesn't use the Good Ring (which only 13.13% of LilyE users have on her)?
252+ Atk darkened LilyE Full Burst Detonate vs. 252 HP / 252+ Def AkyuuD: 51-60 (30.5 - 35.9%) -- guaranteed 4HKO after Leftovers recovery
252+ Atk darkened LilyE Dark Arrow vs. 252 HP / 252+ Def AkyuuD: 84-100 (50.2 - 59.8%) -- 85.5% chance to 2HKO after Leftovers recovery
AkyuuD is strong! 