I can't believe this discussion is even going on. Lucario is not a clone, but he is based off M2.
Lucario and Mewtwo have numerous similarities and differences.
First and most obvious of the similarities is their projectile. Mewtwo's shadow ball and Lucario's Aura sphere both charge in a similar method. That is to say that these projectiles do damage while charging and can be charged in mid air as well. When shooting a small form of either projectile, they both wave up and down. When shooting a fully charged one, Mewtwo's waves up and down while Lucario's travels straight at a greater velocity. When shot from ground level at full charge, Mewtwo's would only sometimes hit someone who was hanging on the edge. Lucario's on the other hand, when shot fully charged will hit a person hanging on the edge every single time. I like this very much.
Next will be the forward smash. Both moves have very similar activation time and range. The major difference here is that Lucario's move is significantly easier to land hits with.
The down smash of Lucario can be described as M2's down smash in both directions slightly elevated. The activation time and lag of said moves are identical.
The up smash of the two characters is very similar as well. Both activate with similar speed and stay out for a similar length of time. The difference here is that Lucario's has much heightened killing power.
Lucario and Mewtwo's jab moves share nothing in common.
Lucario and Mewtwo's rolls also share nothing in common. Lucario's is just plain better,
Their spot dodges have identical time for being out and the lag afterwards.
Mewtwo and Lucario's down throws both have different animations, but the two are the exact same move. Both grab the opponent and slam him into the ground, bouncing him up and in perfect range for whatever it is you plan to do next.
Mewtwo and Lucario have extremely similar back throws, which is simply grabbing the opponent and tossing him behind for considerable distance.
Lucario's forward throw I have not seen much of, but it appears to just be his back throw in front of him, a major improvement over Mewtwo's horribly weak (although very cool) forward throw.
Up throw I have to admit I don't recall seeing Lucario perform.
If you have watched the Lucario match against Wario on Wifiwars' Youtube profile (
http://www.youtube.com/watch?v=POUo-905Zuk), you will see Lucario performing an uptilt. You will notice the area of effect and general speed of the move to seem virtually identical to Mewtwo's uptilt.
Lucario's down tilt is much different from Mewtwo's. While Mewtwo's was a tripping type move that set up for combos, Lucario's looks like it is purely for the purpose of knocking the enemy away. Lucario's tilt also has less range than Mewtwo's.
I have not seen enough of Lucario's other tilts to really comment on their similarity or difference to Mewtwo's. However, if they are similar, all the better, because Mewtwo's tilts were incredible in Melee.
Lucario's side B move is focus palm I believe it is called, and is basically a more ranged forward smash with more lag. This is nothing like Mewtwo's side B move, but that is a good thing.
Lucario's down B move is quite similar to Marth's down B, which is counter. This is a good thing, considering Mewtwo's down B move is lackluster at best.
Lucario's up B move is the only move he has that is nerfed compared to Mewtwo's apparently. Mewtwo's up B move went faster, further, and had less lag. Nonetheless, it is how Lucario is and we will have to deal with it.
I have not seen enough of Lucario's neutral air to say much about it. Others have compared it to Marth's, Mewtwo's, and Zelda's neutral air. If it is similar to Marth or Mewtwo's neutral air, that is a good thing.
Lucario's down air is a straight up major major improvement over Mewtwo's. It looks like a combination of Luigi and Falco's down air from Melee, which is a very good thing.
Lucario's forward air appears to be a longer range and less damaging version of Mewtwo's forward air for the most part.
Lucario's back air has a dramatically reduced range compared to Mewtwo's. It seems to have similar power though.
Lucario's up air seems to have slightly less range than Mewtwo's, but it does seem to have greater power by a very noticable margin, a reasonable trade off.
That will be the moves for the most part.
A few more things to note.
Mewtwo and Lucario's aerial movement horizontally and vertically are basically the same. Lucario does seem much harder to kill than Mewtwo, but still seems easier to kill through the roof of a map than other Brawl characters.
Another interesting difference is that Lucario can wall jump while Mewtwo can not. This may or may not prove useful depending on how many stages with walls are played on and how a player can take advantage of the ability. I think in time, people will figure out some pretty nifty tricks with it.
The final thing I will comment on is that although Lucario's up B is not as good as Mewtwo's Lucario does have the ability to stick onto a wall. I have not seen this happen often nor do I know everything about it yet, but it is a very very interesting ability to have. If you do not know what I am talking about, take a look at the video below at about the 7:30 mark. Watch Lucario recover after being knocked off the stage.
http://www.youtube.com/watch?v=2HU_AJbx10Q
All in all, I would speak of Lucario as a much improved and altered Mewtwo. They are too different to be called clones, but similar enough to say that Mewtwo was a base for Lucario. The same can be said about Fox and Wolf.