Lucario debuted inSteeling Peace of Mind! onIron Island. WhenAsh andhis friends traveled there after being contacted byBarry, they found the localSteel-type Pokémon fighting brutally against each other. When a crazedAggron attacked Ash,Riley stepped in and hadLucario attack it withClose Combat. Despite being a Steel-type as well, Lucario wasn't affected like the others of its type due to its strongaura.
With Lucario’s aura, they found the source of the problem: A machine operated underMars's command that was using theSpear Key to create low frequency waves which tortured the Steel Pokémon. Lucario attempted to read the Aura coming out of the machine, but at that time, Mars placed the Spear Key into a pillar at the Iron Ruins. The pulses of energy beam overwhelmed Lucario and caused it to rebel against Riley, even breaking itsPoké Ball in half when he tried torecall it.
Even then, however, Lucario wasn't completely under the machine's influence and tried to destroy the machine but couldn't do it. Ash managed to finish the job and destroy the machine, so Lucario and the other Steel types were brought back to their senses. When Mars realized her plan was shot, she fled and attempted to blow up Iron Island with explosives, but her efforts were thwarted when both Riley and Lucario used their auras to contain the blast and send it flying.
Following the arrival ofProfessor Carolina, Riley and Lucario decided to remain on Iron Island to investigate the Iron Ruins further.
Personality and characteristics
Lucario possesses a great deal of strength and is selfless in its approach, much like its Trainer. While it has a stoic manner, its good intentions are clear. Lucario works completely in sync withRiley, making them a formidable duo ofAura Guardians. It relies on itsaura abilities which provide Riley with incredible insight, as seen through theirTeam Galactic counter-operation.
Later, whenRiley can be found as a Double Battle partner in theBattle Tower, Lucario is one of the potential Pokémon he may use, and inPokémon Platinum, he will use Lucario at theBattleground as well.
Lucario in Pokémon AdventuresLucario using the four moves in succession
Lucario first appears inGrumpy Gliscor along with his TrainerRiley onIron Island waiting forDiamond to arrive so that they can train him and improve his battling skills. After he arrives, they begin their training. Lucario is pitted againstTru, Don, andLax, and with strong moves likeClose Combat andAura Sphere, he puts them into a tight spot before catchingTru'sWood Hammer and holding him while his Aura Spheres fall from the sky and defeat Diamond's Pokémon. Lucario then oversaw Diamond's training along with Riley, but during their training, he senses something with his Aura that turns out to be twoCue Balls who have stolen aPokémon Egg. The Cue Balls blind Riley and Lucario withVespiquen honey and prevent them from using theirAura with aMothim'sAir Slash, they are defeated by Dia's newest technique: the "Mach-one-and-only-Razor-Leaf" and are left to suffer the wrath of Lucario who beats them withClose Combat,Aura Sphere,Bone Rush, andFlash Cannon in quick succession.
A† shows that the move was used recently, unless all moves fit this case or there are fewer than five known moves.
Pokémon Diamond and Pearl Adventure!
Lucario in Diamond and Pearl Adventure!
Lucario first appears inSerious Training on Iron Island!! as it rescues Hareta froman attack caused byB-2'sGraveler. Later, it takes on B-2'sDrapion where it tried to use Aura Sphere, but fails due to Drapion's 360 rotation effect. Lucario was able to take out Drapion with the teamwork ofHareta'sRiolu given from Riley when it was anEgg.
