The shonen anime genre places a heavy emphasis on battle and combat, which shows how integral the idea of combat is to the genre as a whole. So, naturally, the franchises that belong to this subgenre of anime have shown incredibly powerful techniques over the course of their series.
Just like how this trend tends to go in the genre, there are certain techniques that are much more powerful than others, often belonging to the strongest character in the series. So, in this article, let's go through the strongest finishing moves in the Shonen anime genre that can end an entire fight with just one instance of use.

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Zanka no Tachi is Yamamoto's legendary Bankai
Anime: Whiten
As the most offensively powerful Bankai in the whole Whiten series, Yamamoto's ultimate attack is the pinnacle of fire-type Zanpakuto. This Bankai allows Yamamoto's sword to burn at 15 million degrees, making it so impossibly hot that it doesn't even burn its target, it just obliterates them to nothing. Even when not used in battle, the fire was so hot that it was seen to dry out all of Soul Society and a simple touch was enough to create a massive crack in the ground.
United States Of Smash is a very powerful attack
Anime: My Hero Academia
The United States of Smash is the most powerful technique in All Might's arsenal and the strongest application of the One For All Quirk. Gathering all of his energy and concentrating it into a single fist, All Might unleashes the strongest thunder attack in the entire series whose strength is so astronomical that it leaves a massive crater around the user and even creates a small tornado of wind. When All Might used it, it took everything out of him.
Night guy almost killed a god
Anime: Naruto
When he faced the wrath of Madara's ultimate form, the entire Shinobi Alliance could not face him due to his imperviousness to almost all types of Jutsu. However, since Taijutsu was one of his only weaknesses, Guy opened the Eighth Gate of Death, using which he unleashed his ultimate attack; Night Guy, who almost killed Madara and made him admit that Guy was the only one since Hashirama to get him this excited. If Night Guy wasn't so stressful, using it again on Madara might have killed him.
Rearrange the cases in the correct US release order.
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Rearrange the cases in the correct US release order.
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Bajrang Gun dwarfed an entire island
Anime: One Piece
One Piece is not a series known for its insanely powerful offensive attacks. Despite this, Luffy's Bajrang Gun is still the most powerful attack we've ever seen in the series. Due to Gear 5 allowing Luffy to inflate his fist to titanic proportions making it larger than Onigashima and covering it with Advanced Armament Haki, he was able to rain down a fist that destroyed the island and sent Kaido straight down into Wano's depths.
The domain expansion is an immediate win
Anime: Jujutsu Kaisen
The power system i Jujutsu Kaisen franchise is one of the best in anime, and the top of it is the domain expansions. These are the most powerful techniques in the entire series that only the strongest wizards can use, and when applied in any battle situation, they usually bring a guaranteed win to the wielder. Many domain expansions compete to be the strongest, but regardless of who uses them, they will almost certainly win the match whenever they do.
Saitama's serious punches can destroy planets
Anime: One Punch Man
From this point on, the power scaling goes up by many degrees, with Saitama's Serious Punch being the perfect example of this. Defined by his unparalleled strength, Saitama has the ability to end every single fight he has ever had with a single serious blow, even though most enemies cannot even withstand his normal blows. Over the course of the series, Saitama has eliminated galaxy-level threats and destroyed entire planets with a single Serious Punch, making him one of the strongest characters in anime.

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Super Tengen Toppa Giga Drill Break is impossibly big
Anime: Gurren Lagann
An anime about mechs eventually went outerversal in scale in the final battle against the Anti-Spiral. While the Giga Drill Break used in this battle is practically similar to all other versions, the reason why it is so insanely powerful is due to its massive scale, as the size of it and the components of the final battle are thousands of times larger than the entire universe. Because of this, the Giga Drill Break used in the ultimate clash is enough to end all of reality.
Hakai is the power to erase things from existence
Anime: Dragon Ball Super
The greatest power of all Dragon Ball franchise is Hakai, as this is the signature technique of the multiverse's Gods of Destruction. It's also the easiest to understand, as the Destroyers can use it to essentially erase objects from existence entirely, whether they're as small as a rock or as large as a planet. To make it even more overpowered, Beerus was also shown erasing conceptual and intangible beings. It is theorized that the strongest version of the technique was Grand Zenos, which effortlessly erased an entire universe, making it arguably the strongest technique in the entire anime.
Gold Experience Requiem is the greatest ability of all
Anime: Jojo's Bizarre Adventure, Part 5: Golden Wind
Gold Experience was a particularly powerful stand in its own right, but its awakened form through Requiem Arrow made it the strongest ability of all time. While not an “attack” in the traditional sense, Gold Experience Requiem can essentially take any attack used against the user and reset it to zero, essentially giving him control over causality itself and keeping him safe from all harm. Not only this, but GER also sends the attacker into an endless death loop, where they are trapped in endless scenarios of dying in various ways spanning all of reality, making this perhaps the most overpowered thing in anime.