1. Lucario's first punch (backhanded one) is really similar to La (the same move: advancing with the back of the left hand) with the exception that Lucario's jab is directed to the body (no doubt to damage the opponent) while in kung-fu La is used to disrupt the attacker by directing it to his head and making him open his guard for the next attack:
2. Lucario's second jab attack is the EXACT same as Cheung-nan-choi (or the panther's paw): lightning quick and directed to the ribs of the offender for serious damage (or the head, directed at the eyes to impair the opponent's view). in fact a standard advanced combo is exactly using La to make the opponent open his guard in the stomach to follow up with the panther's paw.
3. Lucario's third attack (the kick) could be any martial arts kick in the world, but it still reminds of kung-fu's straight kick, with the similarity that both Luc's and kung-fu's kick is to push the opponent away instead of dealing damage (though Louie does both at the same time). This is ALSO chained to La and panther's paw, though rarely used because there are better attacks to finish. (my personal favorite is chat-gum: a strong pushing motion with the right hand to make the opponent lose his breath in battle, do it properly and he won't be able to breathe properly for one full minute =3)
pure curiosity, I know, but still fun =D