This whole "Lucario replacing Mewtwo" thing so freaking bizarre in so many ways.
In all honesty, before I was actually more afraid that Mewtwo would get replaced by another legendary "evil" pokemon from a more recent generation, like Deoxys or Darkrai. But
Lucario?! Although it would still suck, at least the former two would actually make sense to replace Mewtwo! (And they're in the same league as Mewtwo as far as power goes)
With seemingly every major franchise getting its own villain rep, it just don't get why Sakurai would remove the perfectly good villain rep from Pokemon and replace him with a non-villain! He was even planning on putting Mewtwo (along with Bowser and Dedede) in the original game, making me think that Sakurai must really like including the bad guys.