Transmission

Transmission (トランスミッション) is an Ultimate Move performed by Izuku Midoriya using the Gearshift Quirk.

Description
Izuku rushes toward his opponent and delivers several punches, with each successive punch increasing the speed of Gearshift, before sending his opponent flying. The increase in speed is labelled as "gears", with the gears being: Each punch of Tranmission is so fast, the sound barrier is broken numerous times, causing the punch to be seen before it is heard.
 * Low Gear, the base speed that is activated upon using Transmission. This speed is demonstrated when Izuku uses Transmission on himself.
 * Second Gear
 * Third Gear
 * Top Gear, the final and fastest speed.

This Ultimate Move is first used against "Tomura Shigaraki" during the Final War.

Trivia

 * Izuku shifting this Ultimate Move like gears may be a reference to One Piece protagonist Monkey D. Luffy's abilities to shift gears, thanks to his Devil Fruit.
 * Furthermore, this may also be a reference to the transmission used in a car, given that it lets the user shift between multiple gears, similar to how a driver shifts gears while driving.