Overview
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Lucario is a very powerful as a Mega Evolution 'Mega' isn't a noun because of a great ability in Adaptability and high offensive stats. It also functions as a decent stop to Xerneas, Dark Arceus-Dark, type Arceus > Arceus-type and Darkrai, becauseit (space between because and it) outspeeds all of these except for the latter, (RC) and can OHKO them with one of Lucario's STAB attacks. Furthermore, it has a nice Speed stat, which allows it to outrun several threats in Ubers, such as Xerneas, Latias, Rayquaza, and Dialga. Lucario has a wide, offensively based movepool with a lot of coverage options, such as Close Combat Close Combat isn't a coverage option, so this could serve to get reworded. and Stone Edge. It also has a good priority option in Bullet Punch, a move whose power gets further boosted by Adaptability. But, Lucario's got has several downpoints. (space between down and points) It However, Lucario Statements in overviews that add length is not usually advised, as overviews should be as short as possible to give a quick summary is pretty frail, meaning most unresisted powerful attacks from most Pokemon with decent offensive stats can deal a lot of damage to it. Additionally, Lucario is very vulnerable to status, because either paralysis or burn will eventually bring cripple Lucario to its end. Lucario is also costly, as it takes a Mega slot that also could have been used for another Mega. this isn't what 'costly' means, nor is 'opportunity cost'. Lastly, Psychic- and Ghost-types can be troublesome for it if Lucario lacks a Dark-type attack, especially Mega Sableye, this is the standard of Mega Evolutions which completely walls it.
Physical Wallbreaker
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name: Physical Wallbreaker
move 1: Close Combat
move 2: Bullet Punch
move 3: Stone Edge / Ice Punch
move 4: Iron Tail
ability: Justified --> Adaptability
item: Lucarionite
evs: 252 Atk / 4 Def / 252 Spe
nature: Jolly
Moves
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Close Combat is becomes extremely powerful after Mega Evolution, because it has a great Base Power you could put 240 here instead if you think it should still be included and gets boosted further by Adaptability, making its base power 240. Bullet Punch is a good priority attack with decent power and helps allows for Lucario to 2HKO Geomancy Xerneas, as well as it's useful to pick off some weakened Pokemon. Stone Edge is a good move that hits most Flying-types better than Ice Punch, especially Ho-Oh, careful on this but also Pokemon such as What kind of Pokemon are these? Lugia and Yveltal. Ice Punch can be used as a third move instead of Stone Edge to hit Flying-type Pokemon that trouble Lucario such as Mega Salamence and Rayquaza better than Stone Edge since because they're both 4x weak to Ice attacks, you shouldn't use since, as it refers to time that has passed and has excellent coverage on the overall. Iron Tail has better power than Bullet Punch and allows Lucario to OHKO Xerneas, and therefore is a good move. Swords Dance allows Lucario to boosts its Attack stat to insane levels, which helps it to break through many physical walls.
Set Details
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Justified is chosen as its ability as it allows (put an "ing" in allowing) Lucario to boosts its Attack right after it switches into Dark-type attacks. Lucarionite is the standard item because this way so Lucario can Mega Evolve, and gets a huge power boost as well as gaining a new ability in Adaptability as a new ability, (swapping order of words to make it flow better) it'd be better to just remove the 'new ability' thing. And it doesn't really flow better; that can be a subjective idea. So be careful with making rewordings like this in the future! which doubles the power of Lucario's STAB attacks. Maximum EVs in Attack ensure Lucario hits its foes as hard as possible. The EVs in Speed backed up with a by Timid nature help Lucario to outspeed several Pokemon in the tier such as max Speed Xerneas, max Speed Adamant Adamant what ;_;, Salamence, and max Speed Kyurem-White.
Usage Tips
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Lucario is a decent switch-in into the Dark-type moves from Dark-type Pokemon it checks, especially when not Mega-Evolved in non-Mega Forme Mega Pokemon are not formes--also, this is the rare case where Mega-Evolved with a hyphen is correct!; this will boost Lucario's Attack stat, thanks to Justified. However, watch out; most Dark-types are faster than Lucario when not Mega-Evolved and can beat it with another attack as Lucario is a bit frail. Make sure you Mega Evolve Lucario as soon as possible, as without it, Lucario won't be able to outspeed the threats it doesn't normally in normal-forme, leaving it easily to be you can use the original or this rewording if you like soulblaster revenge killed.
Team Options
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Cleric support from Pokemon such as Xerneas is very useful, as Lucario is really crippled by having either its Attack or Speed stat cut by status such as burn or paralysis. Dark-types such as Yveltal and Darkrai are great teammates too as they can beat up hit this is a more 'professional' word choice, but beat up is ok in my book! Lugia and Ghost-type Pokemon with STAB Dark-type attacks that are troublesome for Lucario, and especially the former one, as it can switch into the Ground-type attacks Lucario is weak to. Stealth Rock setters users, such as Primal Groudon or one of the Deoxys formes, also make good partners because Stealth Rock is always useful as it helps Lucario to get a KO earlier. Other Pokemon that appreciate Dark-types being defeated by Lucario, such as Aegislash and Latios, make for good partners as well. Slow Volt Switch or U-turn users, such as Scizor, grant Lucario a safe switch in, 'switch-in' (with a hyphen) is a noun used to describe a Pokemon that can switch in safely. 'Switch in' is a verb to describe switching in. A 'safe switch' with no 'in' is what you're looking for which Lucario appreciates, as it's frail. And last, but not least, Defog users that remove Sticky Web when it's up on your side, such as Latias and Giratina-O, are good partners too.
Other Options
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Earthquake is an option for good coverage, but leaves Lucario completely walled by Flying-types if it lacks Stone Edge or Ice Punch. Crunch hits the this is OK to leave in Psychic- and Ghost-type Pokemon, such as Mega Gengar, Lugia, and Mega Mewtwo Y, (AC) well if you start a clause closed off by a comma, you have to close it too that trouble Lucario, as the former type resists its main STAB move and the latter is completely immune to hit. Extreme Speed can be used over Bullet Punch which will outspeed any other +1 priority attack, but has bad coverage and Bullet Punch is after Mega Evolving equal in power. Nasty Plot can be used along with a special set of Aura Sphere / Flash Cannon / Nasty Plot / Dark Pulse or Vacuum Wave, but this doesn't allow Lucario to beat Geomancy Xerneas, which is one of the main Pokemon it should be beating, and is because of that it's Lucina! You have to remember apostrophes :o not very good.
Checks & Counters
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**Ghost-types**: Ghost-types, such as Ghost Arceus-Ghost, Giratina, Mega Gengar, (add comma) and Mega Sableye, (AC) same as above, close of the 'such as section' with a comma. However, if there wasn't a comma at the start, there shouldn't be one at the end. They come in pairs are immune to Lucario's most powerful STAB option, and can burn Lucario and stall it out after.
**Bulky Flying-types**: Bulky-Flying types, such as Ho-Oh, Lugia, and Yveltal, (AC) resists Lucario's Close Combat (except for the latter) and can stall it out and steadily recover health back, but they must be wary for of Stone Edge.
**Ground-types** Ground-types such as Primal Groudon, Ground Arceus-Ground, (add comma) and Landorus-Therian can easily beat Lucario with one of its their STAB attacks, and can reliably switch into most of Lucario's attacks, but have to be wary of Ice Punch.
**Status**: Burns and paralysis are really crippling Lucario, as it will have its Attack or Speed cut, which means it misses out on important KOes 'KOs' is the plural form of 'KO'. 'KOes' means 'to KO' and leaves it weak.
**Mega Mewtwo X**: Mega Mewtwo X can switch in into Lucario's attacks and outspeeds it and can beat it with its Fighting-type STAB attack.
**Faster Pokemon**: Pokemon that are faster than Lucario, such as Choice Scarf Kyogre, Mega Mewtwo, (AC) or Jolly Mega Salamence, can beat Lucario with one of their coverage attacks without effort.