Upon using his Final Smash, Little Mac flashes in a ball of green light before transforming into a hulking form known as Giga Mac. He retains the same moveset, but with a considerable upgrade in power and reach, along with a mobility increase. His smash attacks in particular can deliver high amounts of damage, and offer incredibly high knockback scaling (except for the low angled forward smash, which still deals low knockback), capable of KOing most of the cast below 40%, with the forward angled forward smash being capable of one-hit KOs.
Only four of Giga Mac's attacks have different attributes compared to Little Mac: namely, his neutral infinite is significantly slower but deals more damage, his forward tilt transitions to the second hit slower (though the move's effectiveness remains unchanged), the charge time of Straight Lunge is reduced by half, allowing it to be fully charged in under a second, and Slip Counter's counterattack deals a minimum of 30% damage while still possessing the 1.3x damage multiplier.
Giga Mac has the fastest air speed of all fighters (including the other transformation Final Smashes), despite Little Mac having very poor air speed. He also has the fastest walking speed of any fighter, but only runs faster than Captain Falcon, while losing to Sonic and Wario-Man. Giga Mac's aerial attacks also gain a damage and knockback boost; while they are still considerably weaker than Giga Mac's grounded moves, they become capable of KOing at the 90-100% range at the edge of Final Destination.
Like Giga Bowser, Giga Mac cannot be launched, does not flinch when attacked and cannot have his shield broken, but he can still receive damage. Additionally, Giga Mac is unaffected by Super Mushrooms and Poison Mushrooms, making it impossible for players to alter his size during a match. Likewise, Metal Boxes also have no effect on Giga Mac.
While Little Mac is under the effects of Giga Mac, his Power Meter is temporarily disabled and Doc Louis will not call out during Giga Mac's taunts. Giga Mac reverts back to Little Mac after 11 seconds have passed.
In Super Smash Bros. Ultimate, Giga Mac forgoes having a full moveset to acting akin to Donkey Kong’s new Final Smash, which consists of a single punch that, if successfully landed, leads to a series of rapid punches that traps and launches the opponent.
This Final Smash turns Little Mac into a hulking monster of a man. In Punch-Out!! for Wii, Little Mac could take this form by building up the gauge with some well-timed blows. In this game, it seriously powers up his attacks and makes him even faster. He'll completely dominate on the ground, but air battles are outside his weight class.
In the two-player mode of Punch-Out!! for the Wii, both players control a Little Mac; either can turn into Giga Mac after punching the opponent enough times in a certain area. If they do, the game then shifts from two evenly-matched Little Macs fighting in split-screen to gameplay resembling the single-player mode, with Little Mac fighting a larger and slower Mac. The player controlling Giga Mac gains slower but stronger attacks, in addition to a taunt.
In Punch-Out!! for Wii, there is another Giga Mac color scheme used by the brown haired Little Mac controlled by the second player. However, in Super Smash Bros. 4, Giga Mac only has one color scheme regardless of the costume that Little Mac had prior to using the Final Smash, like other transformation Final Smashes.
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