Lucario is interesting, but he doesn't seem to control as well as Mewtwo did. What do his forward and down specials do, btw?
Who do you mean? Mewtwo's or Lucario's specials?
Mewtwo's side B was Confusion. It had short range and on the first hit would stun the opponent like there shield was broken for a short time. If you did Confusion again while the person was stunned it would act like an attack and launch the opponent outward, but it was not very strong.
Mewtwo's down B was "something Toss", which basically was another short range move that like made the opponent tumble in the air, and sort of trip like characters do in the new game. But it was easy for opponent to recover form this by teching.
Lucario's side be is an energy blast that damages opponents. It has much longer range than Confusion did, and if done close enough to your opponent garbs them and sends them flying as if you performed a stronger version of forward throw. People can't be caught mid-air though. If it is done in the air then it is just a damaging blast.
Lucario's down B is Counter, which can counter both physical and projectile attacks. It's a little slower than Marth's or Ike's, but at least to me seems a whole lot stronger. Not sure how the Counter exactly works though, like if it is the strength of the attack, or based on another factor.
To me Lucario's new special are > than Mewtwo's ever were, but that is just comparing two different moves they possess.