To be fair, when I had a Naganagel sweep going, I OHKO a Blazaken. Beast boost had my speed so high that protecting to boost speed by 1 stage didn't save it, it only postponed it's demise for a single turn. Then again, my scarf Mamoswine OHKO'd a Mega Manetric. It depends on the team, and which roles you'd like them to fulfill.