How does Mega Lucario fare against lower usage pokemon
Blastoise (only Mega): Mega lucario can't OHKO Mega Blastoise, MBlastoise can OHKO with Aura Sphere. The special set can't even 2HKO. And Water Pulse clearly 2HKO and can cripple Lucario with confusion hax.
Mega Gardevoir: Loses with almost OHKO with Bullet Punch and clear OHKo with Flash Cannon but Lucario can't come on a Mega Gardevoir and neither can set up becuase Hyper Voice, which OHKOes.
Scolipede: It can outspeed mega Lucario with Speed Boost. Apart of that, needs Earthquake if Scolipede want to have a chance (and probably not ebing a dedicated BP user)
Vaporeon: Loses because Fighting STAB from the special set from either side 2HKO. Can try fighting the special set with Scald.
Terrakion: Can defeat Mega Lucario on turn 1 (or Scarfed) with Close Combat.
Jolteon: Outspeed on turn 1 and after. Thunderbolt has a chance of OHKO with Choice Specs. Special Lucario can't OHKO.
Mega Medicham. loses 1 vs1 with Drain Punch that overkills. No attack from Lucario can OHKO at +0.
Hydreigon: Scarf Hydreiugon 8the msot common) can outspeed M;ega lucario and OHKO with Fire Blast and Focus Blast.
Landorus. Only CC and Flash Cannon 2HKo landorus. Only Ice Punchs OHKO Landorus Landorus outspeed Lucario on turn 1 and over kills with Earth Power (or even Earthquake).
Slowbro. Can dela with physical lucario which can defeat easily. Scald 3HKOes while Lucario can't. And his high chance opf burn can cause a 2HKO.
Noivern: Outspeed every time. Specs Noivern OHKO Lucario with Flamethrower and Hurricane. The "frail" Noivern can't even OHKo back.
Chandelure: usually it's Scarfed and then outspeed every time and defeats it with 2 Shadow Ball and one Fire move. Lucario can't OHKo with any of his moves.
Mega Manectric: With Intimidate in, CC can't OHKO. Always outspeed Mega lucario. With Modest Nature, (outspeed Mega Lucario) Flamethrower is a guaranteed OHKO. And Thunderbolt is a clear 2HKO.
Mega Heracross: possible 2HKO only with Flash Cannon. CC overkills.
Jirachi: It wins with Choice Scarf Jirachi 1vs1 because Jirachi can'0t be 2HKoed, Jirachi will 2HKO Mega lucario. And Jirachi can have more than one set.
Chansey Obviously loses.
Kyurem-B: Loses against him with the Fighting move.
Deoxys-S: Deoxys-S has a chance of OHKoing Mega Lucario with Psycho Boost. Always outspeeds, it's guaranteed to 2HKO with Psycho Boost, etc.
Jellicent: loses aginst physical set. Wins against special set.
Metagross: Assuming leftovers, Lucario has to be lucky that Earthquake doesn't OHKO. If ti uses CC, it will OHKO.
Umbreon: Always loses. Free set up.
Politoed: Does poorly but has a chance of win to the special set if Aura Sphere doesn't 2HKO.
Celebi: Normally loses but Earth Power has a chance of OHKO. Don't use CC against him.
Gastrodon: Has a chance of OHKO with Earth Power. Guaranteed if Lucario decides to use Close Combat.
Arcanine Wins or ties with Flare Blitz.
Porygon2: Free set up.
Florges. Normally it loses, but it can set up that freely.
Darmanitan: Wins 1vs1 with Flare Blitz if it's the Scarf version. It's better with the special version because Aura Sphere can't even OHKO.
Kelode: OHKOed with Secret Sword and outspeed on turn 1. Special Lucario can't OHKO.
Deoxys-D: Free set up.
Mega Absol: clearly loses (300% from CC, no thanks)
Reuniclus: Given his usual EV spread, it does btter vs Physical version. Normally it loses vs Mega lucario. it clearly OHKoed with Focus Blast.
Magnezone: loses to the fighting STAB.
Haxorus: Risky but it can't set up because oHKO with Earthquake. Flash cannon doesn't even OHKO.
Mega Aggron: Earthquake OHKO Mega lucario. oses to the special set 80% of the time.
Diggersby: I'm sure that Earthquake will OHKO Mega lucario but can't take a Fighting STAB
Quagsire loses to Physical Lucario unless it's burned. Special Lucario loses against it. Earthquakes 2HKO. Swords Dance against him can'0t cost a Mega Lucario.
Crobat: genberally wins vs Physical lucario. 50/50 vs Special lucario (the key it's if Brave Bird 2HKoes).
Crawdaunt: Crabhammer and Super Power OHKoes Mega lucario but don't even try.
Zapdos: better surprisingly with modest in that case, because int hat case Thunderbolt OHKoes after CC (2HKo). Counter of the special set.
Weavile: Don't try with it. The best option if you don'0t have a ghost is tolose your Weavile by clicking Low Kick.
Manaphy: normally lsoes but can use Surf well. If Manaphy got the +3, Koes Mega lucario woith Surf/Scald (can't learn Hydro Pump).
Kingdra: It'0s OHkoed with CC. With this pokemon, there are two situations:
Not rain: Loses to the physical set compeltely. Wins vs the special set if it lacks Aura Sphere.
Rain: Normally: Wins 100% vs Special Mega Lucario and has a 50% of wiining with Surf (Hydro Pump is 80% OHKOed).
Whmsicott: Don't even try.
Ninetales: Wins on turn 1. Wins against Special lucario not having S.
Nidoking it wins with Earth Power.
Thundurus-T: Possible OHKO with Thunderbolt. Lucario can't even 2HKO with his special set.
Ambipom: Does pretty bad but has a chance of winning if he has Low Kick.
Mega Aerodactryl: Risk an OHKO with Earthquake. NMLucario has no problem taking it down.
Miloitic. Normally lose vs physical set, wins vs special set.
Rotom-H; wins with Overheat. Can't swithc in a Close Combat.
Mega Ampharos: . Wins vs Special set. OHKo with Fopcus Blast. high chances pof OHKo with Thunderbolt.
Malamar: Risk of a OHKO with Super Power. Specially Pohysical lucario, don't set up.
Snorlax: You forgot Aura Sphere, you lose. Be warned that Snorlax can cripple it. Obviosuly, CC OHKOes.
Starapotor: Mirror match. Depends of the luck and the set of Staraptor.
Hippowdon. Don't play with the high cance of OHKO with EQ, guaranteed with CC.
Machamp: Can lsoe vs physical lucario. But it will vs Special lucario with Dynamic Punch. You hope that MLucario can't
And I will end with Mew: His most usually it loses tot he physicalmwins versus the special special, but you never know what Mew has.
I got to the following conclusion:
Lucario is very frail, specially from the special side, which has a greater amount of moves that doesn't resist. Having a physical weakness to Fight and ground hurts. the difference between 70/88/70 and 105/100/100 are very different things. For example, Cleebi has 70% to Mega Lucario with Psychic, only 40% to not invested Mega Kangaskhan with psychic (and no super effective move)
The most strong set is the physiucal set with CC.
The special set has a sever case of 4MSs, you have to miss coverage (Dark pulse), miss priority (Vaccum Wave) or miss power (auyra Sphere). Flash cannon is very underwhelming when dealing with Electric, Water and Fire types. and Vaccum Wave don't patch that 90% of the time.
Noone is saying that he doesn't have checks...
problem is, that he doesn't (almost) have COUNTERS!