Mr. Game & Watch (SSBU)/Up special
Mr. Game & Watch bounces off a trampoline set by two firefighters and then opens a parachute during his descent, referencing his game Fire. The move provides Mr. Game & Watch with an incredible recovery as it has high vertical distance with its ascent while the parachute allows him to cover great horizontal coverage, making Mr. Game & Watch very resistant to being edgeguarded. Aside from its recovery potential, the move has a significant number of potent strengths.
Most importantly, the move is notorious for being arguably the single best out of shield option in the entire game. It has incredibly fast startup at frame 3 and two large hitboxes on both sides which makes shield pressuring Mr. Game & Watch a daunting task as the move can even punish some of the safest moves in the game if they are the slightest bit misspaced. In addition to this, it has intangibility during the ascent which makes it useful for breaking out of disadvantage.
It also has great combo starting potential, including at high percentages. Due to its hitboxes launching opponents directly upward, it can chain into his neutral aerial and up aerial with both moves being able to be used consecutively after their inital hit if the opponent is at low to mid percents. It can also extend combos after multiple up aerials as its late hit has high knockback. This allows for long strings of highly damaging combos and contributes to Mr. Game & Watch's strong aerial and juggle game. During the falling animation of the move, it can cancel into any move, most notably a down aerial that allows Mr. Game & Watch to return to the ground should the need arise.
Lastly, it is an amazing edgeguarding tool and gives Mr. Game & Watch great edgeguarding potential along with a dominant offstage presence. Since both the early and late hit deal high knockback, it can be used to KO opponents offstage at high percents with the late hit being more consistent due to its higher damage while also allowing Mr. Game & Watch to safely return to the stage using his parachute. If Mr. Game & Watch is recovering low, it can act as a lethal stage spike, capable of gimping many characters even at low percents.
Overall, due to the move's sheer utility and effectiveness as a recovery move, OoS option, disadvantage breaker, combo starter and extender, and edgeguarding tool, it is widely considered one of the best moves in the entire game and is almost unarguably Mr. Game & Watch's best move.