what the when u try to always insult him u make him do a special attack
Nice to see some people are still stumbling onto this game so long after it was commissioned!
Just like Undertale, everything in this fight references someting or has a double meaning. From the amount of gold (and possibly EXP) you would earn, to damn near every line of dialogue, to the choice of music, to Lucas's moveset...everything planned out to just about the tiniest detail.
I really should post why those were how they were somewhere...it's been long enough. But I'll tell you one right now - when I was getting pissed off over the whole Brawl roster thing, and then the Smash 4 initial roster, nothing got under my skin more than people saw Lucario as a suitable substitute for Mewtwo (and a reason Mewtwo shouldn't have been brought back), and Greninja serving the same purpose on Smash 4's roster (before the DLC was announced.) So some people said that it was an improvement both times - and that's where the final line and thus ultimate attack came from.