La di da~
Neutral B: Bowser Jr. swings his magic paint brush, and a glob of ink flies off of it. If the glob hits the opponent, it will give out damage, and also start too slow the opponent down somewhat. The pain blob takes visual effect on the opponent, and the effects by shaking from side to side, running a bit, or dodge rolling (the later being most effective). The effects do not take much of an effect to the average player, but they do mess with things like attack.
Forward B: Bowser Jr. throws three hammers up over his head, like Yoshi’s eggs. Each hammer has a different trajectory, and unlike Yoshi’s eggs, go all the way to the ground. They are quick with little knock back, but can be a pest to bigger characters, as they can sometimes be hit by two or more. When they hit the ground, they normally just disappear, but every once and awhile, they stay, in which case, either character can pick them up and throw them like a normal item.
Up B: Bowser Jr. sticks his paintbrush up into the air, and a glob of paint makes a portal which he is pulled through. Another portal then appears, and Bowser Jr. tumbles out the opposite way in his shell. The second portal’s spawning point is about as far as a standard teleporting move, and can be positioned with the same amount of fluency. When Bowser Jr. emerges tumbling in his shell, his falling path can be moved as much as another character in permanent falling mode, but he can actually damage opponents who try to pick him off at the spawning point of his portal. The downside to this is when he has a animation where he gets out of his shell, when he hits the ground. For this brief period, he can be hit without the spikes protecting him.
Down B: Bowser Jr. paints a puddle on the ground, and a slime piranha plant pops up. The plant can’t move from its puddle, and is CPU controlled. It is fairly dumb, but it can quickly snap, if an opponent gets to close. It can take a hit from the opponent, but about as much as a standard box can. Bowser Jr. can only make one at a time.
Final Smash: Bowser Jr. summons a giant Mecha-Bowser that appears from the ground onto the stage. The creature is invincible for the short amount of time it is there, but it is fairly slow. It can make hops, but they can barely make it up onto low platforms, not that you really need to do such a thing. Pressing A flails around the arms, in any directions. (Up A causes them to rise and spin near his head, neutral near his torso, and down near his legs) B causes a stream of fire from the Mecha’s mouth, and B forward sends out a slow moving bullet bill. These projectiles are fairly easy to dodge, but are very powerful. It lasts about as long as Giga Bowser.