Ya'll are using lucario wrong.
Lucario gets nasty plot now to increase spattack.
Every single pokemon in OU NOT listed on here gets OHKO by special lucario after one boost, the stats are here. Some pokemon like celebi, latias/latios, bronzorg are taken care of by dark pulse so they have been removed from the list. But mega lucario is best as a special as physical walls like skarmory, land-t...etc are wiped out. Land-t cannot reduce lucario's attack either and burns no longer matter.
Quick example of special luke:
http://pokemonshowdown.com/replay/pokebankoubeta-59158969
(switched out on aggron because of study otherwise full team sweep)
+2 252 SpA Adaptability Lucario Flash Cannon vs. 252 HP / 252+ SpD Multiscale Dragonite: 34.45 - 40.67%
+2 252 SpA Adaptability Lucario Aura Sphere vs. 248 HP / 240+ SpD Zapdos: 42.29 - 49.86%
+2 252 SpA Adaptability Lucario Flash Cannon vs. 252 HP / 60 SpD Multiscale Dragonite: 44.81 - 52.84%
+2 252 SpA Adaptability Lucario Flash Cannon vs. 252 HP / 4 SpD Multiscale Dragonite: 47.4 - 55.95%
+2 252 SpA Adaptability Lucario Aura Sphere vs. 248 HP / 0 SpD Tentacruel: 48.76 - 57.57%
+2 252 SpA Adaptability Lucario Aura Sphere vs. 248 HP / 8 SpD Gyarados: 52.16 - 61.57%
+2 252 SpA Adaptability Lucario Aura Sphere vs. 240 HP / 0 SpD Volcarona: 53.36 - 63.07%
+2 252 SpA Adaptability Lucario Aura Sphere vs. 160 HP / 0 SpD Volcarona: 56.41 - 66.66%
+2 252 SpA Adaptability Lucario Flash Cannon vs. 0 HP / 4 SpD Multiscale Dragonite: 56.65 - 66.87%
+2 252 SpA Adaptability Lucario Flash Cannon vs. 4 HP / 0 SpD Multiscale Dragonite: 56.79 - 66.97%
+2 252 SpA Adaptability Lucario Flash Cannon vs. 0 HP / 0 SpD Multiscale Dragonite: 56.96 - 67.18%
+2 252 SpA Adaptability Lucario Aura Sphere vs. 88 HP / 0 SpD Gyarados: 58.64 - 69.12%
+2 252 SpA Adaptability Lucario Aura Sphere vs. 252 HP / 252+ SpD Meloetta: 61.88 - 73.26%
+2 252 SpA Adaptability Lucario Aura Sphere vs. 0 HP / 0 SpD Gyarados: 62.53 - 73.71%
+2 252 SpA Adaptability Lucario Flash Cannon vs. 0 HP / 0- SpD Multiscale Dragonite: 63.46 - 74.92%
+2 252 SpA Adaptability Lucario Aura Sphere vs. 0 HP / 4 SpD Volcarona: 63.66 - 75.24%
+2 252 SpA Lucario Dark Pulse vs. 252 HP / 220+ SpD Jellicent: 64.85 - 76.73%
+2 252 SpA Adaptability Lucario Flash Cannon vs. 248 HP / 8 SpD Cresselia: 65.91 - 77.65%
+2 252 SpA Adaptability Lucario Aura Sphere vs. 80 HP / 0 SpD Zapdos: 66.27 - 78.29%
+2 252 SpA Adaptability Lucario Flash Cannon vs. 252 HP / 252+ SpD Dragonite: 68.91 - 81.34%
+2 252 SpA Adaptability Lucario Aura Sphere vs. 252 HP / 252+ SpD Togekiss: 72.72 - 85.56%
+2 252 SpA Adaptability Lucario Flash Cannon vs. 252 HP / 228+ SpD Amoonguss: 72.68 - 85.64%
+2 252 SpA Adaptability Lucario Flash Cannon vs. 252 HP / 244+ SpD Venusaur: 73.62 - 86.81%
+2 252 SpA Adaptability Lucario Aura Sphere vs. 0 HP / 0 SpD Moltres: 74.14 - 87.22%
+2 252 SpA Adaptability Lucario Aura Sphere vs. 4 HP / 252+ SpD Blissey: 74.23 - 87.73%
252 SpA Adaptability Lucario Aura Sphere vs. 252 HP / 4 SpD Quagsire: 74.61 - 87.81%
+2 252 SpA Lucario Dark Pulse vs. 252 HP / 56+ SpD Slowking: 74.61 - 87.81%
+2 252 SpA Adaptability Lucario Aura Sphere vs. 252 HP / 236+ SpD Jirachi: 74.75 - 88.11%
+2 252 SpA Adaptability Lucario Aura Sphere vs. 128 HP / 0 SpD Thundurus-T: 75.22 - 88.82%
+2 252 SpA Adaptability Lucario Aura Sphere vs. 252 HP / 0 SpD Eviolite Chansey: 75.56 - 89.2%
+2 252 SpA Adaptability Lucario Flash Cannon vs. 28 HP / 248 SpD Wobbuffet: 77.27 - 90.9%
+2 252 SpA Adaptability Lucario Flash Cannon vs. 252 HP / 252+ SpD Mr. Mime: 82.39 - 97.18%
+2 252 SpA Adaptability Lucario Aura Sphere vs. 0 HP / 0 SpD Thundurus-T: 83.27 - 98.32%