Overview
Kirby does a vertical kick. It is widely regarded as among the best attacks in the game, and maybe even the series, due to dealing high damage (14% clean, 10% late), quick speed, ability to break shields via repeated use (which is very possible due to the quick speed), ability to combo (can combo into itself for up to 60%+ depending on the opponent), and a ridiculously disjointed hitbox that covers the length of more than one Kirby both horizontally and vertically - this alone is the reason why Kirby hard counters Yoshi, as it outspaces all of his approach options. Due to having very high range and damage, it can also easily outprioritize almost all attacks (even a Falcon Punch, as the cancellation range is just within the Falcon Punch's primary hitbox).