Random Incredibly Strong Anime Attacks That Were Only Used Onc (13 items)

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  (#2) Mugetsu - 'Bleach'

  After using a technique called Saigo no Getsuga Tenshō, Ichigo Kurosaki is able to achieve a form called Getsuga that dramatically changes both his appearance and his strength. Once in this form, he's able to use Mugetsu. Mugetsu lets him generate a huge black blade of Reiatsu energy that severely damages everything unlucky enough to enter its path.

  Using Mugetsu means the loss of Ichigo's Shinigami powers, so it's a huge gamble. Luckily, he managed to land a hit that forced Aizen to revert to a previous evolutionary stage, making it possible to defeat him.
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  (#5) United States of Smash - 'My Hero Academia'

  United States of Smash is All Might's most powerful technique. It's not that different from his other attacks - it's a powerful punch with a ton of energy behind it - but the energy levels are on another planet. He managed to grind his nemesis All For One into the dirt with it, despite the fact that his quirk had been mostly transferred to Izuku and his severe injuries made it difficult for him to fight at all. This would be All Might's last fight, and it was one of his most epic.

  This isn't really the first time All Might used the attack, but it's the only time viewers get to see its full glory. Too bad, because it was probably ten times more amazing when the man was at his peak. It's also possible that this won't be the last time we see United States of Smash, either. While All Might's powers were extinguished, Izuku still has a lot to learn about the complex quirk he inherited. 
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  (#11) Final Stage - 'The Big O'

  The battle against Alex Rosewater and Big Fau might have been lost if not for this one-shot power-up move. By linking herself to the Big O itself, Dorothy is able to transform it into its final stage. The biggest change that the mecha undergoes is the appearance of a giant cannon in the middle of its chest that can fire off enough energy to destroy a giant dome. The Big O was already powerful, but this change makes it one of the most formidable mecha outside of the Gundam franchise.  
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  (#13) Muscle Gravity - 'Ultimate Muscle'

  Not too many anime fans remember this series, but that doesn't make its epic one-time move any less epic. When Kid Muscle goes up against the seemingly far stronger Kevin Mask during a tournement, he manages to turn a seemingly one-sided fight around by developing an ultimate move that reverses his opponent's attack at zero hour. This is after getting both of his arms broken, among other injuries.
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  (#9) Super Tengen Toppa Giga Drill Break - 'Gurren Lagann: The Movie'

  The Super Tengen Toppa Gurren Lagann is an enormous mass of energy that breaks all laws of reality, so naturally it's most impressive attack, Super Tengen Toppa Giga Drill Break, is guaranteed to do the same. The drill itself is 20 trillion light years long - 200 times bigger than the universe itself. It also moves faster than light, travelling that distance in a matter of seconds. When the attack collides with the Anti-Spiral Giga Drill Break, space-time collapses on itself. That's the kind of thing you can't do more than once. 
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  (#6) Flame Emperor - 'One Piece'

  Flame Emperor is Portgas D. Ace's most incredible attack. Using his Flame-Flame Fruit, he creates an enormous fireball that resembles the sun. The thing nearly engulfs an entire island. An impressive display of strength, but unfortunately not enough to take down Blackbeard and his Dark-Dark Fruit. 

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