1 button

From SmashWiki, the Super Smash Bros. wiki
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The 1 button

The 1 button is a small button located towards the bottom of the Wii remote, right above the 2 button. When playing Super Smash Bros. Brawl with the Wii remote and Nunchuk, the 1 button executes a character's up taunt. If 1 and 2 are pressed together in Nunchuk style, a character does their side taunt. When playing with the Wii remote held sideways, the 1 button is used for special moves. If 1 and 2 are pressed together in horizontal style, the character performs a smash attack.