How do I Falcon Punch? Super Smash Bros Brawl
Captain Falcon's Falcon Punch is the Neutral Special, documented here.
Falcon Punch is Captain Falcon's Neutral Special Move in the Super Smash Bros. series. The move consists of Captain Falcon throwing a powerful punch, with his fist engulfed in a Falcon-shaped flame.
The Neutral Special Move button is bound by default to the B button, and can be referenced here.
The Neutral Special Move (also commonly referred to as Standard Special Move, Neutral B, or simply B) is a Special Move performed by pressing the special move button without holding a direction on the control stick. Many of these moves are projectiles, which can be used repeatedly to rack up damage indirectly and/or hinder the enemy's approach.