Well since everyone else is doing a trailer, here's mine:
The Smash Symbol Slash appears, and we see Zero Suit Samus and Ike enjoying a walk in the forest. They sit down to rest when Pokey's machine emerges from the trees. As they prepare to go on the offense we hear, "PK Love!" The machine takes some damage and the screen pans towards Lucas. (Take that, Gematsu!) Smashing Song of Praise begins to play.
Lucas sticks it to 'em!
We see some Lucas gameplay, including PK Freeze being replaced by PK Love and the inclusion of Offense Up. It cuts back to our heroes, who prepare to finish off Pokey, when he pushes a big red button. All of a sudden, a group of Mechon burst from the nearby shrubbery. They all try attacking these mechanized fiends to no avail. Pokey laughs in the background. When all hope seems lost, a blue blade flashes in front of the screen. All the Mechon are destroyed, and behind the wreckage is none other than Shulk! You Will Know Our Names starts playing here.
Shulk predicts his arrival!
His gameplay footage shows off his various Monado powers, including the Monado Buster and Team Smash only Monado Enchant, which gives his teammate(s) a slight range and knockback boost. Back to our heroes, they focus their attention on Pokey as he tries to escape. It's no good as Shulk initiates a Chain Attack on him. With Lucas cheering them on, ZSS paralyzes the machine, Ike Aethers it, and Shulk finishes it with a Monado Buster. The massive flash of blue light ends the trailer. For the stinger, everyone's breathing a sigh of relief when Reyn walks into frame and says, "What a bunch of jokahs!" End trailer.