>>51295753>252+ Atk Tyranitar-Mega Bullet Seed (5 hits) vs. 4 HP / 0 Def Breloom: 330-390 (125.9 - 148.8%) -- guaranteed OHKOBreloom only OHKO's at +2, which means it needs a turn to use Swords Dance, which means Edgetar gets a free hit on it.
STAB neutral Bullet Seed (changed Bullet Seed and Ttar's Dark-type to ???-type) OHKO's Breloom.
Not that the turn of setup really matters, because your Breloom is +Atk and Edgetar outspeeds all Brelooms that aren't +Spe.