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252+ SpA Choice Specs Magnezone Thunderbolt vs. 0 HP / 4 SpD Lucario: 322-381 (114.5 - 135.5%) -- guaranteed OHKO
This set would be good to surprise if opponent uses Swords Dance/Nasty Plot expecting a switch
Extra: 252 SpA Magnezone Thunderbolt vs. 0 HP / 4 SpD Lucario: 196-232 (69.7 - 82.5%) -- 81.3% chance to OHKO after Stealth Rock and 3 layers of Spikes
You could also use Aurora Veil Ninetales-A to make it take a Close Combat, and Sash Lucario is for shitty brainlet players anyways
Magnezone should learn Overheat