The Upperdash Arm (豪腕ダッシュアッパー, Strong/Stout-Arm Dash Upper) is a weapon from Kid Icarus Uprising, acting as Pit's new side special move in Super Smash Bros. 4.
The move involves Pit dashing forward, and then uppercutting any opponent he comes across with the Upperdash Arm, similarly to Raptor Boost, although slower and traveling a shorter distance. The move has armor during the uppercut, allowing Pit to plow through attacks to land a hit, and can also deflect projectiles while the move is active, though it will cut short Pit's dash as he will swing his Arm prematurely. The move does 11% with mainly vertical knockback, and can KO at 150%. Because of its armor and ability to deflect projectiles, this move is incredibly difficult to counter with attacks alone, requiring an opponent to either dodge or shield.
If used in the air, the move has a massively laggy ending animation regardless of whether Pit hits anything (however, more endlag is experienced if Pit misses in the air, enough to make him SD), making the move simple to punish if Pit misses. The move itself does not have much landing lag, however. Connecting with it in midair also gives Pit an upward boost that can have its momentum controlled much like a normal jump, and can be performed right afterward once more after the recovery. The ending lag can lead to possible self-destructs if used unwisely, although the move can sweetspot ledges if used as a recovery. Using the move on the ground will cause him to stop at the very edge of whatever platform he's on, similar to Fox Illusion. Despite the massive aerial ending lag, Pit is not put into a helpless state afterwards. The aerial version is weaker than the grounded version, doing 9% and unable to KO until 170%.
In the Japanese version, Pit may occasionally yell out "Dash Upper!" ("ダッシュアッパー!") upon connecting.
Dark Pit's side special move is Electroshock Arm (豪腕デンショッカー, Strong/Stout-Arm Electric Shocker), a variant of Upperdash Arm with an electric effect. It is also slightly stronger, dealing 12% on the ground, and 9.5% in the air, and launches opponents at a 43° angle instead of straight up. Dark Pit occasionally blurts "Electroshock!" (or "デンショッカー!"; Electric Shocker! in the Japanese version) if the move connects.
Although it will tend to KO later than Upperdash Arm from center stage, the move can KO opponents much earlier near the sides of the stage as it sends opponents towards the side blast lines, starting at 50%. The move is hence best used against opponents who tend to stray near the edge a lot, and it can be worth the risk using the move offstage as an edgeguard to guarantee an early KO.
Special Move customization was added in Super Smash Bros. 4. These are the variations:
Arms are one of the weapon classes in Kid Icarus Uprising. Weapons in this class boast power in both melee and ranged combat, but are short-ranged and have a slow attack speed (in addition to considerably slowing Pit's running speed); this is referenced by Pit's move in Smash 4, having good knockback but suffering punishable ending lag. The Upperdash Arm has weak normal attacks but strong melee dash attacks. The back-dash charged shot from this weapon is capable of sending foes airborne.
Meanwhile, the Electroshock Arm inflicts paralysis, and has expanding charged shots. Unlike the Silver Bow and Dark Pit Staff, Dark Pit never uses this weapon in Uprising (unless the player equips it when controlling him).
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