Stun Grenade (閃光弾 Sutan Gurenēdo?) is a move performed by Katsuki Bakugo using his Explosion Quirk.
Katsuki starts creates a sphere of light between his hands that explodes into a large scale flash. Similar to the effect of an actual stun grenade, the flash of light blinds anyone close by.
It is especially effective against Quirks that are weak against light, such as Fumikage Tokoyami's Dark Shadow. Katsuki first uses this move to overpower Fumikage during the U.A. Sports Festival.
- The animation for using Stun Grenade bares a striking resemblance to the Final Flash attack from the Dragon Ball series.
My Hero Academia Manga and Anime: Chapter 42 and Episode 24.