Lucario holds a special position within the Pokemon community. It was basically the mascot of gen 4, was the star of one of the Pokemon movies before gen 4's reveal, was one of Cynthia's Pokemon, was on Ash's winning champion team, got an OP mega evolution while it lasted, and it remained so ubiquitous and popular that it even wound up in Pokken Tournament and even more impressively Smash Bros.
On the competitive side it also boasts an impressive offensive movepool, the ability to run physical and special sets augmented by boosting moves like Swords Dance and Nasty Plot, access to three priority moves, and partial Steel typing which gives it some defensive utility and making it one of the few Fighting types that does not fear Fairy types. However Lucario is far from perfect sitting at a weird speed tier that does not quite break 100, and its defenses are low and could not sponge a hit without its secondary typing. But this aura Anubis continues to be popular long after gen 4 and remained a staple choice for playthroughs in subsequent generations for both casual and competitive players, so let's give the dog his day.
Augmented Anubis
Ability: Justified/Steadfast
Item: Life Orb
Nature: Jolly/Timid
EVs: (HP 4) (Attack/Special Attack 252) (Speed 252)
Moves:
Swords Dance//Nasty Plot
Close Combat//Aura Sphere
Meteor Mash//Flash Cannon
Extreme Speed/Bullet Punch//Vacuum Wave (Or a coverage move)
Set Details:
An offensive boosting set that can go physical or special given Lucario's balanced offenses and access to both Swords Dance and Nasty Plot. Boost your offenses, Close Combat or Aura Sphere becomes your Fighting STAB, Meteor Mash or Flash Cannon become your anti-Fairy Steel STAB, and Extreme Speed, Bullet Punch, or Vacuum Wave become your priority move to work around your not quite perfect speed. However you can also opt to sub in a variety of coverage moves too such as Thunder/Ice Punch, Dark Pulse, Crunch, Earthquake, or even Agility! All stats get poured into offense and speed while your ability goes to either Justified on physical sets or Steadfast on special ones provided you can anticipate an incoming Dark attack or flinch. I miss Adaptability on the mega form, and frankly Lucario should have gotten Mega Launcher to compliment all its pulse moves.
So regardless if you are playing a main line game, spinoff, or even Smash Bros, know that Lucario is always there to serve as your reliable partner both on and off the battlefield.