You forgot the most relevant calc. +6 0 Atk Braviary Brave Bird vs. 252 HP / 4 Def Registeel on a critical hit: 323-381 (88.7 - 104.6%) -- 31.3% chance to OHKO. Also, Registeel never has to click sleep talk while sleeping, which effectively gives it 104 PP vs Braviary's 88. (Rest is 16 x 3, Curse is 16, Iron Head is 24, Sleep Talk is 16).
EDIT: I got the pp for brave bird wrong.
				
			EDIT: I got the pp for brave bird wrong.
			
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