Adventure Mode.

[Black Boo]

I was thinking of a basic Melee-style Adventure where you go through different games and fight themed enemies and then other fighters as boss characters. The only difference is that as you unlock more characters, more stages are added to adventure mode. That was the only problem with Melee's. If you got someone new they were still ignored in Adventure. For example, unlocking, say, all the Pokemon characters unlocks a Pokemon themed stage and bossesfor Adventure that can be wedged into the existing lineup of stages.

you dissagree with this you are dumb

That's like the perfect plan dude.

Just gonna point out though, Melee's did wedge in Pichu and Jigglypuff, but that was just a "beat the wave" kinda thing so it's irrelavent.