Lucario DOES NOT:
have steel bones; bones are made of calcium and stuff. Steel is MAN MADE MATERIAL.
Karate skills; he's a pokemon that's just able to walk on two feet. that hardly justifies organized combat skills. even chimps can't learn karate. they can be worked with to perform some actions such as break wooden boards, but they're trained to do so. Lucario has NO ONE TRAINING HIM.
have higher intelligence; being mammal allows for better intelligence, but not enough to know any form of martial arts. he can understand human language. attack strategy would still be limited. he's related to a canine and should be treated as such.
Lucario's only conventional forms of attack are bite and pimp backhand spike slap.
@Toc
Meh. His head is what troubles me most. But with the rest of his body weight being centered could allow for that.
@Nova
Yoshi's part Dino. Dino's have teeth. Just because he isn't shown chewing things doesn't mean he doesn't have teeth. Something that size MUST have teeth.
@Sam
Animals like cats walk on all fours. That allows for agility. Lucario is walking on two feet. Less surface area to work with means less agility. He may be able to run, but quick movement like a quick side step can easily cause him to fall over.
1. Call it what you like, but he isn't called steel and fighting for no apparent reason. I get the point about his skeleton not being made of steel and him not knowing kung fu. However, Luc can still fight, considering he has been doing it long enough. It may not be kung fu but it's effective enough. As far as Luc being steel, I haven't found a concrete explanation but I just have to look into it.
2.He isn't a canine; he's a Lucario. Canines fight with their teeth and claws (see Wolf). Cario fights in an entire different fashion that could be portrayed as martial arts. He is able to use his paws, teeth, spikes, and feet. He also walks on his tippy toes and uses his tail to balance himself while moving. And he can always walk on all fours if the time called for it.
3. Yoshi has teeth but he doesn't have the teeth bearable to kill Luc. for starters,
http://yoshi.2yr.net/pics/mario-party-advance-yoshi2.jpg
Yoshi has no neck, meaning he has to turn his entire body to attempt a bite. He also has a huge nose that gets in the way of his teeth (Not to mention, the nose/snout of an animal is always very sensitive; I see a giant green bulls eye for Luc's spike...). So realistically how does Yoshi get his teeth on Luc in a convenient fashion? He doesn't..
Yoshi has only been shown to eat fruit and swallow turtle shells. I doubt he has the set of teeth to rip flesh.