I agree in that Lucario is the only Pokémon that deserves to enter SSBB (well, along with Meowth). Here´s a movelist I made for him. It´s not much, because I´m not good at these things, but oh well.
LUCARIO
from Pokémon Diamond & Pearl
STATS (Out of five)
Strength - ****
Weight - ***
Speed - ***
Jump - **
A-MOVES would essentially consist of kicks, punches, the occasional tail swipe and the use of Aura for smashes. Fairly close-range, and defensively oriented.
B-MOVES
B - Focus Blast: Lucario faces forward and edges back slightly, closing its eyes and holding its arms out. A sphere of yellow energy about as tall as Lucario appears. The Pokémon leans back and then pushes forth with its whole body, sending the orb traveling in a straight trajectory across the stage. It travels about as fast as a Charge Shot and does high damage, but the charge time is pretty long. The blast keeps moving after hitting opponents.
B-Up - Force Palm: Lucario leaps upward; if it comes in contact with an enemy, it will grapple them and then throw them down with an unnerving cracking sound, which also impulses Lucario upward further. The move doesn´t offer much recovering unless it comes into contact with a foe, and can continue to climb upward it it were to hit two others.
B-Side - Me First: Lucario assumes a particular fighting stance and looks forward. If an opponent comes into physical contact with Lucario while it is in this stance (which lasts for about 0.5 seconds), Lucario will throw them in the opposite direction, dealing the exact amount of damage that the foe was going to inflict with the move he/she was about to use, but with 5% added.
B-Down - Dark Pulse: Lucario closes its eyes and concentrates in place as dark flames dance around its feet. A short instant later, three projectiles of shifting, black miasma will emanate from its body, homing into enemies at the speed of Samus´ missiles. When they make contact they inflict the foe with a dark burn, dealing constant damage for several seconds.
Final Smash - Aura Sphere: The screen darkens as Lucario closes its eyes, sensing everyone´s aura. A glowing blue ring will appear on one of the opponents. If the battler fails to evade it, which is quite difficult, Lucario will launch an Aura Sphere, a large orb of pulsing blue energy which always hits the target. It deals less damage than the average Final Smash, but has surprisingly high knockout potential.