Alright so got into this idea of making a Super Smash Bros movie, and really it could work very well. Though things will sorta differ from the actual game, it is pretty much the same. But ah lets see what my mind has come up with shall we? 
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Title: Super Smash Bros 
 
Rating: PG  
 
Type: Animation
 
Characters: Mario, Link, Samus, Fox, Falco, Capt Falcon, Donkey Kong, and Kirby. 
 
Plot: The characters have been summoned by an unknown being(Master Hand), upon arriving in another dimension they are addressed by a dis-embodied voice(Hand) that they have been summoned to fight for his amusement. At first the characters refuse to, but the Hand then says that if they do not fight their worlds/universe will be destroyed and so reluctantly the characters agree to fight for now and so each character is then transported to a fighting arena, in which said characters face off against one another. When the fights end, the remaining characters are brought back to where they first were and the Hand addresses them again saying that those who lost have been transported back to their world, when in reality they were turned into trophies that the Hand intends to keep. There is then a group fight with the remaining characters, who face metal versions of themselves and also Fighting Wire Frames and when this fight is over the Hand finally appears to who are left from the fighting, he then reveals to them the trophies of the other fighters and that he was never intending on releasing them. 
 
A fight breaks out between who is left and the Hand, though at the start the Hand dominates each of them before one is knocked into the trophies and upon touching the base  of the trophy the character is free. In doing so, the Hand loses power and finally all of the characters attack and fight the Hand and when defeated a portal similar to how the characters arrived opens up, the characters then say farewell to eachother and head back to their own universes. 
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Now the fights in how they play out between the characters, are the same, there would be items dropping on the battlefield for the characters to use. Haven't decided on what the battlefields would be like though, still thinking on that.  
 
But now to get to how the characters arrive, now I will say I haven't thought of how all of them would. Am thinking it only shows a few characters being transported, and when they arrive the other characters are already there..but anyway here are my thoughts. 
 
Link- Link is walking through the forest, and upon approaching a steep hill he takes a glance down seeing something rather shiny but then decides to dismiss it quickly. However he loses his footing, and falls rolling down the hill to the bottom and coming into view of the green portal, curious he walks to it and enters as the portal disappears behind him. 
 
Fox & Falco- Fox and Falco are chasing a Pirate Lord through a canyon in their Arwings, however the two are then split up from Slippy and Krystal and as the two maneuver through the canyon they see and fly right into the green portal infront of them having not had enough time to turn or avoid it. 
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All I can really think of for now, so folks. What do ya think?