The Move List (or Skill Preview) is a feature in Super Smash Bros. Ultimate that shows the player the special moves and Final Smashes of every playable character. It is accessible from the Help menu in the Dashboard, the pause menu, and Training Mode. A list of all available characters can be displayed with the X button; any characters currently in the match will be highlighted.
In addition to special moves, the following characters also have extra sections either detailing a fighter ability, or further explaining a complex or multi-step special move.
By default, the entries for Mii Brawler, Mii Swordfighter and Mii Gunner will have their default special moves displayed in the Move List, with their names preceded by a "1". If a Mii Fighter is present in a match, their selected special moves will be displayed instead, indicated with the corresponding number (if multiple Mii Fighters of the same type are present, only the one with the lowest port will have its special moves displayed).