I have done a one-hit KO on Bone in this video. Bones have the most health out of all random enemies (160 HP) in OARQ and Bone is a boss on Level 13. When Processor is at Level 25, a perfectly timed attack deals 160 damage, enough to one-hit KO Bones. 179 XP is required to level up from 24 to 25, and 1760 XP in total. More info in the description.