One of the things I'd like to see is that the next Smash Bros. tries to add more players to a single game. I don't mean mess with the four player format, I mean improvise on this option similar to tournament mode.

Tag-Team Mode acts like the tag team mode in Street Fighter x Tekken, where players can switch out characters on the fly. In Subspace Emissary, each stock acted like a new character - this is much the same, except players are only allowed up to two characters, and the damage percentage follows the individual characters. Switching works a lot like the Pokemon Trainer.

There's two ways to play Tag-Team Mode. One person can have a single player slot, or two players can be one team where they both take up a single player slot. One player controls the first character, and if they switch out or die, second player comes in with their character. Switching out has a pause time and must be on the ground so that it doesn't become a nuisance.