After the world was saved, all of the heroes and newfound friends decided to become a community. They lived in the new built town known as Smashville. They had bulit a small arena, in which was actually a teleporter that took them to the real stages to where they fight, such as Green Greens, or Final Destination. The community was peaceful and brawlfully fun! But in the forgotten wasteland of subspace, rose a forgotten face. One that the folks of Smashville just might remember. He looked to the sky of subspace and said, "I'm back... Lucario."
~Prolouge idea: Mewtwo's Return
Or...
It was a quiet day in the Plains. Mario, Pit, and Link were walking through the Plains, enjoying the good weather and calming aroma, when a flash in the sky caught Mario's eye. He looked up, to see a large Stadium drop onto the flattest part of the plains. It was so strong and well built, that it didn't break. Mario looked at it, when a hologram TV screen shot up above from it. There was a tiny creature sitting on a bean-bag chair, and he was happier than ever. He announced his new R.P.G. Stadium. Mario, Pit, and Link looked at each other, and with excitment of a new challenge, left to grab everyone else. The little creature, turned off the hologram Tv, and chuckled a little bit, then said, "I can't wait for this fight... because they're destined to lose!"
~Prolouge Idea2: Victini's Challenge