Waluigi Moveset:
B: Tennis Racket ~ Waluigi pulls out his tennis racket and strikes his opponent with it. Move can be charged.
B>: Waluigi Kart ~ Waluigi jumps into a kart from the familiar Mario Kart series and charges in the direction the player is facing, however once he has started driving in one direction, he cannot turn around. Move can be charged to increase distance.
B^: Dice Block ~ Waluigi leaps up into the air, this has a fairly high recovery. When used on the ground a dice block appears above Waluigis head and he strikes it. The dice block stops on a random number to determine the amount of damage dealt to an opponent.
BV: Potted Piranha ~ A Piranha Plant grows out of the ground in front of Waluigi, he picks it and pots it. He can then walk around using his BV move to shoot a small fireball from the Piranha Plant, when he presses the A button he throws the pot and it smashes on contact with any surface.
Final Smash: Wall-Luigi! ~ Waluigi crouches down and then raises his arms. As he raises his arms vines shoot out of the stage and begin attacking opponents. Once Waluigi lowers his arms the vines slowly sink back into the ground.
(Also, I think you meant "ground" on the Dice Block move.)