ARMS Rush is Min Min's Final Smash in Super Smash Bros. Ultimate.
Overview
Min Min begins with her left ARM that can only hit one opponent. If she hits her opponent successfully, most of the cast from ARMS will show up and hit that opponent with their respective ARMS. Min Min then deals her finishing blow with her laser from her Dragon ARM.
Origin
In ARMS, each fighter has their respective Rush ability, which it can be filled up by their Rush Gauge during the match. When the gauge is full, the player will unleash the fighter's Rush Ability to deal a lot of damage to their opponent.