While I want to defend Pokedude, as he seems to be a pretty awesome guy, it would seem a few topics HAVE mentioned Power Stone (whatever that is). That said, the majority of such discussion looks to have been quite a long time ago. And seriously, there's no need to be rude. Also, a quick search will easily fact-check.
To answer the TC, it would appear no one's mentioned it since 2011-ish.
I did check before I said anything. A few topics that never reached 20 posts and didn't involve discussion of TC's claim at all. If you're going to fact check, be thorough about it. Just because a game was mentioned once or twice doesn't mean it was ever a hot topic.
http://i.imgur.com/rbBq9.jpg Come to the board in my quote for math discussion and pretty much anything else.
Huh? Smash Bros came out before Power Stone in 1999
^This. Smash came out in Japan 21st January 1999
Power Stone came out in Japan 25th February 1999
Seeing as how close their release dates were, I highly doubt either of them copied one another. Usually when you have one developer copy another there's a few years gap between the games. The game to be copied needs to prove itself as popular/successful before anyone thinks "Oh hey we could make money with something like that too!"
100 Awesome Kirbys: http://www.vgcats.com/comics/?strip_id=253 UK gamer with online Smash64 and MvC3