Backstory.
Lucario and Trainer infiltrated an illegal underground pokemon fight club, where pokemon fight to death or near death, with only physical moves, there were a device that suppressed any special attacks. Things happened, and Lucario and Trainer managed to free the pokemon who were in too small cages, the humans escaped into some larger cages to protect themselves against the wild and rather angry pokemon.
Trainer and Lucario then found the suppression machine and disabled it, also decided it was better to escape before it got too wild. Trainer and Lucario escaped, and shortly after the place escaped(they suspected all the pokemon attacked at once) so the duo decided it was better to get far away so police wouldn't find them and ask too many questions.
Later that evening they noticed a shadow following them. It was an ABsol, that was the fight clubs best fighter, taken as young from the wild and trained constantly, he was an effective and ruthless killer in the ring. Absol was wounded and covered in dirt and dry blood, the Trainer was not able to get close to the Absol, Lucario was able to get close, take care of the wounds and clean his fur.

Some time later, Absol has learnt to trust the Trainer, and is able to battle against other trainers without going for the opposing pokemons throat immediately. But sometime he can almost lose control and be very rough against an opponent, usually Lucario is able to calm him down.
Absol is very fond of this Lucario(and trainer ofcourse) so if some wild pokemon decides to threaten the Lucario, Absol can go into a frenzy and attack without much thought.
Here a wild pokemon decided to attack Lucario, and Lucario is trying to stop Absol from attacking an already defeated opponent.
Will take some time, and Absol will hopefully calm down.
Current moveset is Swords Dance, Fire Blast, Shadow Ball and Psycho Cut

Strangely thanks to Absols past, he is able to fight efficiently and without wasting too much energy, and is great at dodging attacks and reading opponents movement, when he doesnt go crazy. He is calm and trusting around the Trainer and the trainers other pokemon, but is careful around strangers, and Absolutely hates if someone tries to pet him.