Talk:Mega Man VS Astro Boy/@comment-26488478-20151110213525/@comment-1652808-20151110223138

http://bulbapedia.bulbagarden.net/wiki/Lucario_(Pok%C3%A9mon)

According to Bulbapedia, the whole "Gets stronger as he takes more damage" thing is a mechanic unique to smash, as it's not shown to be in any pokedex entries. However, composite Lucario would have this ability, and the fact that he can detect anyone from anywhere as well as read their thoughts makes him have plenty of opponents.

However, even for a total warfare, vs Yang would be a waste of a battle, since there are several characters who probably have much more similar backstories (If you want to use Lucario's backstory from the Mystery of Mew, which would include his trainer dying and swearing to protect the sacred place they met at), while Yang vs Lucario's only connection is "I get stronger when I take damage.", a trope that tends to come up a lot in media (Tekken 6 has a similar mechanic, namely "Rage Mode", Multiple games have a bar that go up the more you take damage, etc).