Saki Zatoichi
Smash Ace
All Lucarios are not emo. Most of them like their trainers because they are forced to maim other pokemon and obey your every command, isn't that what being a good parent is all about?
And if he WAS emo, he would cut himself and make himself stronger, effectively making him cut himself harder, making him stronger. Eventually his arm STILL wouldn't come off because he's made of freaking steel.
That doesn't make Lucario emo. It makes him a masochist.