The command list mode is a mini-demo of sorts. You'll be taken to the character select screen, where you can pick from any of the 29 characters in the game. Upon picking a character, you'll then get to see their command list, which has all of their special and desperation moves listed on it. Press start to fight, you'll always be fighting on the Japan team's stage.
When the match begins, you'll have 60 seconds to fight against your opponent (you'll always fight against whichever character you're playing as). You and your opponent both have infinite health so go nuts with combos and special moves. Desperation moves are also available, but as you have infinite health, super desperation moves can't be used in this mode.
After the 60 seconds are up, you'll get a time over and the match will end. You'll then get a win quote from your character (which is voiced) and then will be returned to the character select screen. Click on a character portrait below to view their command list!